Okay I've managed to solve this, hopefully this will help other people
If ActiveWorkbook.MultiUserEditing Then
ActiveWorkbook.AcceptAllChanges
'Enter form date with offset'
Range("A" & Rows.Count).End(xlUp).Offset(1).Value = TxtQA.Value
Range("B" & Rows.Count).End(xlUp).Offset(1).Value = TxtAgent.Value
Range("C" & Rows.Count).End(xlUp).Offset(1).Value = TxtTL.Value
Range("D" & Rows.Count).End(xlUp).Offset(1).Value = TxtDate.Value
Range("E" & Rows.Count).End(xlUp).Offset(1).Value = TxtBP.Value
Range("F" & Rows.Count).End(xlUp).Offset(1).Value = TxtUpOpt.Value
ActiveWorkbook.Save
End If
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