open file with cell value as filename

I have been trying to adapt this code to open another workbook (to populate a table) using the entry in "A3" as the filename. Tells me file cannot be found. What am I overlooking. File is in same directory

Sub GetData()



 Dim varCellvalue As String

 varCellvalue = Range("a3").Value

 Workbooks.Open ("p:/My Documents/Driver Database/" & varCellvalue & ".xlsm")
 End Sub

Name of actual file required is "14 Driver Assessment wk44"

Any help Appreciated

text content of "A3" is "14 Driver Assessment wk44"
Any help appreciated