Asyn. Thanks for that.
Incidentally even though I removed MSE last week before installing Avast, on the morning of the 15th I noticed my PC was running very slowly, low and behold I had 4 large updates from Microsoft which took over an hour to download/load.
I asked Microsoft live chat why whilst I was getting updates after the 14th cut off date and they explained that I might get them for a few weeks afterwards! I have now turned off the download/install facility and Avast seems the be working fine-without any interruptions about upgrading.
So far a pretty painless swap from MSE to Avast. Thanks to your self any other Members for the advice.
Regards
R.