Thanks for the continued support, chaps. I've still not given up hope yet.
Graham - the driver version I'm using is exactly the same as the one you used (a bit of dyslexia in my previous post) so that eliminates one aspect. I wonder if you know where i can get a copy of V1.9 of Jeromi Paul's Modeline Editor? The only one I can see is V1.10 (which, interestingly, looks different to the version shown on Peter's webpage (
http://www.nostalgiatech.co.uk/Baird%20240%20lines.htm ) even though it has the same version number. The version I have doesn't have the "tiling" "composite" "VGA1" and "VGA2" tick boxes.
Peter - I have tried changing the 404 to 405 lines and hitting "save changes" followed by the requested PC reboot. When I reload the programe it has reverted to 404.
There may well be a fault in my TV22 but there's not much point in my inputting video with 60us lines and inverted vsync every 40mS (surely vsync should be at 20mS intervals, or have I got that wrong?). I can't seem to get back to the waveform that I showed in post #4.