Looping problem

Hi,
I have a rather long section of code that I have been told could be made much simpler by creating a loop routine. I am not very good at VBA and I mostly "cobble together" bits of code I find on here to suit my needs.

A pivot table is sent to me each week which I copy into the workbook with the code.
The code I have at present copies the values of the pivot table into a new workbook and does a lot of other stuff not relevant here. The code works well, but if the standard list gets added to, then the code has to be adjusted to accomodate the change. I am trying to loop through a named range of products so that if the product list grows or shrinks then it wont matter.

I basically want to look down column A on sheet1 to see if any items are missing compared to the standard list in a named range called "ProdPnum".
If an item is missing I want to insert the "ProdPnum" value in column A at the correct row and also the value of (ProdPnum offset one cell right) into column B. I then want to continue this process for as long as there is a value in the named range "ProdPnum".
As I said, I'm not great at VBA and the loops I have tried to adjust to suit, either don't loop or loop forever or just throw up errors.
I have trimmed down the workbook to the bare essentials and commented out some code in the attached workbook for easier reading. The section of code in question is below, and I have attached the workbook.
As always, any help is greatly appreciated.

'check to see if the LGB data is missing and insert it after the "I" if it is
Set fndLGB = Worksheets("Sheet1").Columns("B:B").Find(What:="LGB", lookat:=xlWhole)
If fndLGB Is Nothing Then
       Set fndLGB = Worksheets("Sheet1").Columns("B:B").Find(What:="I", lookat:=xlWhole)
       If Not fndLGB Is Nothing Then
            fndLGB.Offset(1).EntireRow.Insert
            fndLGB.Offset(1).Value = "LGB"
            fndLGB.Offset(1, -1).Value = "653801A"
        End If
End If

'check to see if the RGB data is missing and insert it after the "K" if it is
Set fndRGB = Worksheets("Sheet1").Columns("B:B").Find(What:="RGB", lookat:=xlWhole)
If fndRGB Is Nothing Then
       Set fndRGB = Worksheets("Sheet1").Columns("B:B").Find(What:="K", lookat:=xlWhole)
       If Not fndRGB Is Nothing Then
            fndRGB.Offset(1).EntireRow.Insert
            fndRGB.Offset(1).Value = "RGB"
            fndRGB.Offset(1, -1).Value = "652301A"
        End If
End If

'check to see if the L1 data is missing and insert it after the "RGB" if it is
Set fndL1 = Worksheets("Sheet1").Columns("B:B").Find(What:="L1", lookat:=xlWhole)
If fndL1 Is Nothing Then
       Set fndL1 = Worksheets("Sheet1").Columns("B:B").Find(What:="RGB", lookat:=xlWhole)
       If Not fndL1 Is Nothing Then
            fndL1.Offset(1).EntireRow.Insert
            fndL1.Offset(1).Value = "L1"
            fndL1.Offset(1, -1).Value = "683881A"
       End If
End If

'check to see if the L2 data is missing and insert it after the "L1" if it is
Set fndL2 = Worksheets("Sheet1").Columns("B:B").Find(What:="L2", lookat:=xlWhole)
If fndL2 Is Nothing Then
       Set fndL2 = Worksheets("Sheet1").Columns("B:B").Find(What:="L1", lookat:=xlWhole)
       If Not fndL2 Is Nothing Then
            fndL2.Offset(1).EntireRow.Insert
            fndL2.Offset(1).Value = "L2"
            fndL2.Offset(1, -1).Value = "683891A"
       End If
End If

'check to see if the L3 data is missing and insert it after the "L2" if it is
Set fndL3 = Worksheets("Sheet1").Columns("B:B").Find(What:="L3", lookat:=xlWhole)
If fndL3 Is Nothing Then
       Set fndL3 = Worksheets("Sheet1").Columns("B:B").Find(What:="L2", lookat:=xlWhole)
       If Not fndL3 Is Nothing Then
            fndL3.Offset(1).EntireRow.Insert
            fndL3.Offset(1).Value = "L3"
            fndL3.Offset(1, -1).Value = "948521A"
       End If
End If

'check to see if the L4 data is missing and insert it after the "L3" if it is
Set fndL4 = Worksheets("Sheet1").Columns("B:B").Find(What:="L4", lookat:=xlWhole)
If fndL4 Is Nothing Then
       Set fndL4 = Worksheets("Sheet1").Columns("B:B").Find(What:="L3", lookat:=xlWhole)
       If Not fndL4 Is Nothing Then
            fndL4.Offset(1).EntireRow.Insert
            fndL4.Offset(1).Value = "L4"
            fndL4.Offset(1, -1).Value = "948531A"
       End If
End If

'check to see if the L5 data is missing and insert it after the "L4" if it is
Set fndL5 = Worksheets("Sheet1").Columns("B:B").Find(What:="L5", lookat:=xlWhole)
If fndL5 Is Nothing Then
       Set fndL5 = Worksheets("Sheet1").Columns("B:B").Find(What:="L4", lookat:=xlWhole)
       If Not fndL5 Is Nothing Then
            fndL5.Offset(1).EntireRow.Insert
            fndL5.Offset(1).Value = "L5"
            fndL5.Offset(1, -1).Value = "683861A"
       End If
End If

'check to see if the L7 data is missing and insert it after the "L5" if it is
Set fndL7 = Worksheets("Sheet1").Columns("B:B").Find(What:="L7", lookat:=xlWhole)
If fndL7 Is Nothing Then
       Set fndL7 = Worksheets("Sheet1").Columns("B:B").Find(What:="L5", lookat:=xlWhole)
       If Not fndL7 Is Nothing Then
            fndL7.Offset(1).EntireRow.Insert
            fndL7.Offset(1).Value = "L7"
            fndL7.Offset(1, -1).Value = "683871A"
       End If
End If

'check to see if the L6 data is missing and insert it after the "L7" if it is
Set fndL6 = Worksheets("Sheet1").Columns("B:B").Find(What:="L6", lookat:=xlWhole)
If fndL6 Is Nothing Then
       Set fndL6 = Worksheets("Sheet1").Columns("B:B").Find(What:="L7", lookat:=xlWhole)
       If Not fndL6 Is Nothing Then
            fndL6.Offset(1).EntireRow.Insert
            fndL6.Offset(1).Value = "L6"
            fndL6.Offset(1, -1).Value = "683872A"
       End If
End If

'check to see if the FFF data is missing and insert it after the "L6" if it is
Set fndFFF = Worksheets("Sheet1").Columns("B:B").Find(What:="FFF", lookat:=xlWhole)
If fndFFF Is Nothing Then
       Set fndFFF = Worksheets("Sheet1").Columns("B:B").Find(What:="L6", lookat:=xlWhole)
       If Not fndFFF Is Nothing Then
            fndFFF.Offset(1).EntireRow.Insert
            fndFFF.Offset(1).Value = "FFF"
            fndFFF.Offset(1, -1).Value = "948501A"
       End If
End If

'check to see if the FFR data is missing and insert it after the "FFF" if it is
Set fndFFR = Worksheets("Sheet1").Columns("B:B").Find(What:="FFR", lookat:=xlWhole)
If fndFFR Is Nothing Then
       Set fndFFR = Worksheets("Sheet1").Columns("B:B").Find(What:="FFF", lookat:=xlWhole)
       If Not fndFFR Is Nothing Then
            fndFFR.Offset(1).EntireRow.Insert
            fndFFR.Offset(1).Value = "FFR"
            fndFFR.Offset(1, -1).Value = "683831A"
       End If
End If

'check to see if the FFL data is missing and insert it after the "FFR" if it is
Set fndFFL = Worksheets("Sheet1").Columns("B:B").Find(What:="FFL", lookat:=xlWhole)
If fndFFL Is Nothing Then
       Set fndFFL = Worksheets("Sheet1").Columns("B:B").Find(What:="FFR", lookat:=xlWhole)
       If Not fndFFL Is Nothing Then
            fndFFL.Offset(1).EntireRow.Insert
            fndFFL.Offset(1).Value = "FFL"
            fndFFL.Offset(1, -1).Value = "683841A"
       End If
End If

'check to see if the R1 data is missing and insert it after the "FFL" if it is
Set fndR1 = Worksheets("Sheet1").Columns("B:B").Find(What:="R1", lookat:=xlWhole)
If fndR1 Is Nothing Then
       Set fndR1 = Worksheets("Sheet1").Columns("B:B").Find(What:="FFL", lookat:=xlWhole)
       If Not fndR1 Is Nothing Then
            fndR1.Offset(1).EntireRow.Insert
            fndR1.Offset(1).Value = "R1"
            fndR1.Offset(1, -1).Value = "683941A"
       End If
End If

'check to see if the R2 data is missing and insert it after the "R1" if it is
Set fndR2 = Worksheets("Sheet1").Columns("B:B").Find(What:="R2", lookat:=xlWhole)
If fndR2 Is Nothing Then
       Set fndR2 = Worksheets("Sheet1").Columns("B:B").Find(What:="R1", lookat:=xlWhole)
       If Not fndR2 Is Nothing Then
            fndR2.Offset(1).EntireRow.Insert
            fndR2.Offset(1).Value = "R2"
            fndR2.Offset(1, -1).Value = "683951A"
       End If
End If

'check to see if the R3 data is missing and insert it after the "R2" if it is
Set fndR3 = Worksheets("Sheet1").Columns("B:B").Find(What:="R3", lookat:=xlWhole)
If fndR3 Is Nothing Then
       Set fndR3 = Worksheets("Sheet1").Columns("B:B").Find(What:="R2", lookat:=xlWhole)
       If Not fndR3 Is Nothing Then
            fndR3.Offset(1).EntireRow.Insert
            fndR3.Offset(1).Value = "R3"
            fndR3.Offset(1, -1).Value = "948541A"
       End If
End If

'check to see if the R4 data is missing and insert it after the "R3" if it is
Set fndR4 = Worksheets("Sheet1").Columns("B:B").Find(What:="R4", lookat:=xlWhole)
If fndR4 Is Nothing Then
       Set fndR4 = Worksheets("Sheet1").Columns("B:B").Find(What:="R3", lookat:=xlWhole)
       If Not fndR4 Is Nothing Then
            fndR4.Offset(1).EntireRow.Insert
            fndR4.Offset(1).Value = "R4"
            fndR4.Offset(1, -1).Value = "948551A"
       End If
End If

'check to see if the R5 data is missing and insert it after the "R4" if it is
Set fndR5 = Worksheets("Sheet1").Columns("B:B").Find(What:="R5", lookat:=xlWhole)
If fndR5 Is Nothing Then
       Set fndR5 = Worksheets("Sheet1").Columns("B:B").Find(What:="R4", lookat:=xlWhole)
       If Not fndR5 Is Nothing Then
            fndR5.Offset(1).EntireRow.Insert
            fndR5.Offset(1).Value = "R5"
            fndR5.Offset(1, -1).Value = "683921A"
       End If
End If

'check to see if the R7 data is missing and insert it after the "R5" if it is
Set fndR7 = Worksheets("Sheet1").Columns("B:B").Find(What:="R7", lookat:=xlWhole)
If fndR7 Is Nothing Then
       Set fndR7 = Worksheets("Sheet1").Columns("B:B").Find(What:="R5", lookat:=xlWhole)
       If Not fndR7 Is Nothing Then
            fndR7.Offset(1).EntireRow.Insert
            fndR7.Offset(1).Value = "R7"
            fndR7.Offset(1, -1).Value = "683931A"
       End If
End If

'check to see if the R6 data is missing and insert it after the "R7" if it is
Set fndR6 = Worksheets("Sheet1").Columns("B:B").Find(What:="R6", lookat:=xlWhole)
If fndR6 Is Nothing Then
       Set fndR6 = Worksheets("Sheet1").Columns("B:B").Find(What:="R7", lookat:=xlWhole)
       If Not fndR6 Is Nothing Then
            fndR6.Offset(1).EntireRow.Insert
            fndR6.Offset(1).Value = "R6"
            fndR6.Offset(1, -1).Value = "683932A"
       End If
End If

Skeleton-with-code.xlsm