It seems that the scammers are starting to branch out, this afternoon I received a telephone call from 'Microsoft Technical Support' telling me that there was a problem with my PC, the gentleman on the other end was called Hans and he spoke German but with a heavy Indian accent. Well, the best way to deal with these people is to humor them so I went to the website he asked, downloaded the executable, and ran it under Wine on Linux Mint.
To his credit he tried for ten minutes to get to the Control Panel but of course the access permissions on Wine are quite strict and he got nowhere. I kept on hearing "I do not understand, I do not understand" until there was a soft click in the earpiece and he was gone.
Just in case he left anything nasty the hard drive was then cleaned and I restored a new Linux image from backups. Logs show that my /Home directory was never touched. I know that this is a bit of a non-story but at least we now know there is another way to waste their time, hopefully they will eventually give up.