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I had the same experience with Omni. It was nice enough but nothing special and cost an absolute fortune!
What sort of thing are you after @jono84? If you're after something more casual, I had a good vegan chicken burger thing at Walker Briggs in Crystal Palace recently. It's a pub rather than a restaurant but has a fully vegan menu and a decent drinks selection.
Another casual option is Yard Sale Pizza in Crystal Palace. Not much room to sit in but you can get it delivered to the bottle shop over the road (or Craft Metropolis in Penge).
Coopers (also in Crystal Palace) is pretty nice as well, maybe a bit more upmarket feeling with a better wine/cocktail menu and pretty good vegan/non vegan food menu.
ltc
Went to Omni recently and was a little underwhelmed (for the cost). I like Peachy Goat in Herne Hill. Menu is more basic but it's nice.