16 of the buffet recipes in the BBC's Good Food collection are marked 'Vegetarian' and they come with reviews from people who've tried them as well:
http://www.bbcgoodfood.com/recipes/collection/buffet
(That's page 1 of 2)
I like Quorn mini sausages. Yummy. And samosas and pakoras, spring rolls and cheese twists and gherkins and crisps and chips and boiled but 'devilled' eggs and coleslaw and potato salad. Yummy.