Running through RGB scart will reduce flicker and sharpen the picture. You could also run in NTSC and overscan that, NTSC runs at 60 Hz rather than 50, so you get less flicker out of it.
If you have an A1200, you can run in double PAL or double NTSC, slightly slower, but high resolution, and flicker free. (you might need to connect the miggy to the VGA in on your LCD)
