Czechoslovakia was only a country from 1919 until the early 90s when it split in two. Previous to 1919 it was part of Austria-Hungary.

The countries named have very little in common. It can't be about languages since Scotland speaks mostly-English. It could be about food or music or dances. The tube has me.

The only thing I can think of that would match Mav's bio is that he plays bridge and Omar Sharif (the Egyptian actor - Egypt being one of the named countries) is also a bridge player. It's a long shot but I'm guessing that tube has something to do with Bridge. The only terms I know from that game are rubbers and tricks.

So you played out some classic bridge problems posed by players from those countries and then finished off the night tinkling on the ivories.

Getting warm, Mav?