Missing Operator Error

Below is the code that concatenates a pathway ('c:asset_captureimages) and a column value (c:asset_captureimages)to populate another column ([Carriageway].[Hotlink])


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Function Update_Image()

For Each tbl In CurrentDb.TableDefs

If tbl.Name = "Carriageway" Then

strsql1 = "[" & tbl.Name & "]" & ".[hotlink]"
strsql2 = "[" & tbl.Name & "]" & ".[position]"

'**** THE LINE BELOW WORKS****

'CurrentDb.Execute "UPDATE Carriageway SET [Carriageway].[Hotlink] = 'c:asset_captureimages' & [carriageway].[position]"

'**** THE LINE DOESN'T WORK WHEN STRING VALUE REPLACES COLUMN****

CurrentDb.Execute "UPDATE Carriageway SET [Carriageway].[Hotlink] = 'c:asset_captureimages'" & strsql2


End If

Next

End Function

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The module works perfectly when the column value is hardcoded as [carriageway].[position] but when a string is replaced as strsql2 then the error message "Run Time Error 3075 Syntax Error (Missing Operator) in Query Expression" is generated.

Any ideas gratefully received what seems a simple problem that is causing significant swearing and hair loss.

Thanks

Paul