Add declaration to XML file

Creating XML out of data in Database  by calling proc with bcp as
SET @SQL= 'bcp "exec TEST_433_Oaky_Creek.dbo.proc" queryout '+ @FileName +' -w -r -t  -Sdd\SQL2005 -T '
(proc produced below)
Everything is fine => creates XML as desired.
Now task is to Add Declaration to this XML (<?xml version="1.0" ?>)

How can this be achieved either in below proc or concating XML with other file (containing the declaration)
Attached is XML produced from proc.
Thanks

SELECT  ( SELECT TOP 1
                    ShiftDate AS "ShiftDate",
                    Shift AS "Shift"
          FROM      [TableName]
        FOR
          XML PATH(''),
              TYPE
        ),
        ( SELECT    EquipmentId AS "WasheryProductionDetails/EquipmentCode",
                    'n/a' AS "WasheryProductionDetails/ActivityCode",
                    'n/a' AS "WasheryProductionDetails/ReasonCode",
                    Parentmaterial AS "WasheryProductionDetails/WasheryFeed/MaterialCode",
                    ParentStockpile AS "WasheryProductionDetails/WasheryFeed/ROMStockpileCode",
                    CAST(ParentTonnes AS DECIMAL(18, 4)) AS "WasheryProductionDetails/WasheryFeed/FeedTonnes",
                    ChildMaterial AS "WasheryProductionDetails/WasheryOutput/MaterialCode",
                    ChildStockpile AS "WasheryProductionDetails/WasheryOutput/ProductStockpileCode",
                    CAST(ChildTonnes AS DECIMAL(18, 4)) AS "WasheryProductionDetails/WasheryOutput/ProductTonnes"
          FROM      [TableName]
        FOR
          XML PATH(''),
              TYPE
        )
FOR     XML PATH(''),
            ROOT('WasheryProduction')

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