My fears confirmed 
I think this will be the way to go for my problem, from the link given
Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Cells.Count > 1 Then
Exit Sub
End If
On Error GoTo ErrHandler:
If Not Application.Intersect(Me.Range("A1:A10"), Target) Is Nothing Then
If IsNumeric(Target.Value) = False Then
Application.EnableEvents = False
'Target.Value = StrConv(Target.Text, vbLowerCase)
'Target.Value = StrConv(Target.Text, vbUpperCase)
'Target.Value = StrConv(Target.Text, vbProperCase)
Application.EnableEvents = True
End If
End If
ErrHandler:
Application.EnableEvents = True
End Sub
Thanks to you both for the input, much appreciated
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