Bother! I had hoped it would be simpler!

The dvd I had plays NTSC & PAL on a PAL tv without any change in settings - and would play on NTSC with a menu change. Hence my hopes.

I've also been able to hack it so there's no region check.

Looks like I have much more experimentation ahead. I have a planned trip to the US in a few weeks. I'll take a copy and see how it reacts.

Nick