Thanks Londo,
The problem only occurs on my laptop - it is working fine on the desktop.
It has only ever occurred since the installation of MFP 8, hence my thoughts that it relates only to MFP 8.
I am quite happy to reinstall Office 2010 if thought necessary.
I calculate my selections on the desktop, save the selections in Notepad to a stick, and import them onto my laptop, which I use to place my bets.
Excel is used to maintain my stats and profit/loss.
The really unusual thing about the problem is that if I reinstall MFP 8 and Excel is open during the installation, it will connect. But as soon as I close for the day, recognition will not occur next time I open MFP 8.
One of life's peculiarities.
bobh