Question Author
AOG - apologies for the confusion.
Yes, you need to disable your AVG in order for a System Restore to take place.
In my case, because I couldn't disable my AVG successfully, I un-installed it - but when the PC restored, the AVG was picked up and restored because it was on the PC before the restore datw, so it got picked up with everything else.
If you are able to disable your AVG, then it sould be a simple matter of disabling, restoring, and then re-enabling again.
Apologies for any confusion - we (ahem!) senior gentlemen don't always handle technology with the skill of younger users - although you do seem to have the edge on me! LOL!
Best,
A.