adapt excel postcode distance calculator

I'm trying to adapt code I've found to my needs and it's working as I'd expect pretty much. However, there's an issue I need to fix I hope you guys can help with.

Basically, I have engineers travelling from one place to another, frequently via a middle destination, but not always. I have a script that looks up the postcode distances and this works just fine for valid postcodes, but I can't work out how to put logic in the code to make it work for when the engineer travels without going to the middle destination.

To explain, look at engineer1 screenshot.

As you can see, engineers normally go from home to tote, to job. However, they MAY go direct from tote to job, or direct from home to job. I need the code to have enough logic to compute this somehow.

The code I'm using currently does the "home to tote" column calculation, and then does the "tote to job" calculation, and this works well. However obviously the "n/a"'s cause a problem and reflect 0 miles.

I'm hoping someone can assist me :)

Thanks!

My current code is attached.

Ross

Private Sub GetDistances_Click()

RowCount = 2
FirstCol = "C"
LastCol = "N"
ColCount = Columns(FirstCol).Column

Set IE = CreateObject("InternetExplorer.Application")
IE.Visible = False

URL = "http://www.postcode.org.uk/country/uk/_postcode-distance-calculator.asp"

IE.Navigate2 URL
Do While IE.readyState <> 4 Or _
IE.busy = True

DoEvents
Loop

With Worksheets("Sheet1")
Do While .Cells(RowCount, ColCount) <> ""
StartLocation = .Cells(RowCount, ColCount).Value
EndLocation = .Cells(RowCount, ColCount + 1).Value

Set Form = IE.document.getElementsByTagname("Form")
Set inputform = Form.Item(0)

Set Postcodebox = inputform.Item(0)
Postcodebox.Value = StartLocation

Set Postcodebox2 = inputform.Item(1)
Postcodebox2.Value = EndLocation

Set POSTCODEbutton = inputform.Item(2)
POSTCODEbutton.Click

Do While IE.readyState <> 4 Or _
IE.busy = True

DoEvents
Loop

Set Table = IE.document.getElementsByTagname("Table")
Set DistanceTable = Table.Item(3)

Set DistanceRow = DistanceTable.Rows(2)
distance = Val(Trim(DistanceRow.Cells(5).innertext))

Cells(RowCount + 0, ColCount + 7) = distance

RowCount = RowCount + 1
Loop
End With

RowCount = 2
FirstCol = "D"
LastCol = "N"
ColCount = Columns(FirstCol).Column

Set IE = CreateObject("InternetExplorer.Application")
IE.Visible = False

URL = "http://www.postcode.org.uk/country/uk/_postcode-distance-calculator.asp"

IE.Navigate2 URL
Do While IE.readyState <> 4 Or _
IE.busy = True

DoEvents
Loop

With Worksheets("Sheet1")
Do While .Cells(RowCount, ColCount) <> ""
StartLocation = .Cells(RowCount, ColCount).Value
EndLocation = .Cells(RowCount, ColCount + 1).Value

Set Form = IE.document.getElementsByTagname("Form")
Set inputform = Form.Item(0)

Set Postcodebox = inputform.Item(0)
Postcodebox.Value = StartLocation

Set Postcodebox2 = inputform.Item(1)
Postcodebox2.Value = EndLocation

Set POSTCODEbutton = inputform.Item(2)
POSTCODEbutton.Click

Do While IE.readyState <> 4 Or _
IE.busy = True

DoEvents
Loop

Set Table = IE.document.getElementsByTagname("Table")
Set DistanceTable = Table.Item(3)

Set DistanceRow = DistanceTable.Rows(2)
distance = Val(Trim(DistanceRow.Cells(5).innertext))

Cells(RowCount + 0, ColCount + 7) = distance

RowCount = RowCount + 1
'ColCount = ColCount + 1
Loop
End With

IE.Quit

End Sub

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engineer1.JPG