I'm afraid the problem is in my head!!


My only defence is that advancing years seem to have dulled what powers of intellect I ever had! I confess it took me some time to follow your solution, but eventually the penny dropped!



So, very many thanks for following this, and pointing the solution to the 'non-problem' out, and apologies for wasting your and particularly Logit's time.


I really resent the loss of the time that I have spent on this, but at least my faith in Excel has now been restored, and I've learned a bit of new stuff on the way!


To Logit - thanks for your interest and persistence - you may have gathered that had you not replied to my last post, I would have given up!


So once again, very many thanks!!