Thanks Dave

I've now got it working fine by putting the macro in a General module and
named it Auto_open.

But I'm curious as to your first answer. I can see the listing of
sub-headings such as
AcceptLabelsInFormulas
Date1904
IsAddIn
etc and the editable item immediately to the right of each.
Which item do I put the macro in?
Or is this a feature of later versions of excel (I use office 97)
?

Thanks

Nigel