I tried an old JVC portable TV I had, but it looks like it doesn't work on 60Hz at all (rolling display from my PC-Engine) - which is an issue as I have both 50Hz and 60Hz RGB signals to cope with.
Any suggestions? I don't really want anything bigger than about 17".
The old Amiga monitors would be a good choice as they do 15KHz RGB at 50-60Hz, but they're ancient these days.
Oh, cheap and available in the UK would be good!