The Swiss Chalet gets my vote for a fantastic Sunday carvery lunch. The chef, Liam, cooks the most beautiful enormous joint of beef - each time I think I should try one of the other roast or fish options but I cave and go back to the beef.
We tried Horizons in PSM the other weekend and had a really great meal there too. The reports from other tables were that the desserts were out of this world (especially the strawberry cheesecake, judging by the sighs of jealousy from three people who had ordered something different), but we were too full by then to eat another morsel.