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Got it!
I was actually doing things the wrong way round.
So the answer is on record, what I did was change the value of the cell that teh option buttion groups are linked to, which forceds the buttons to "select themselves" as it were:
Private Sub OptionButton1_Click()
Application.ScreenUpdating = False
Sheets("Option").Unprotect
Sheets("Option").Range("k4").Value = 1
Sheets("Option").Range("k6").Value = 1
Sheets("Option").Range("k8").Value = 1
Sheets("Option").Range("k10").Value = 1
Sheets("Option").Range("k12").Value = 1
Sheets("Option").Select
Application.ScreenUpdating = True
End Sub
'repeated for the other 5 buttons on teh Menu sheet
Dave