Yes SCART is better quality because it carried RGB signals separatley. I think all UK TVs have still have SCART and probably will for some years to come. Some LCD TVs will even eliminate the flicker in interlaced modes.
You might even be able to test your Amiga with TVs at the one of the shops to see what works best. If they say no, play them off against each other and say Currys or whichever are happy to let you test it out. Most sales people won't want you buying it from a competitor.
