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There's an only-just-opened vegan takeaway place near Preston Road station, which is where I'd go if I were there (but obviously can't recommend for lack of having tried it). One very positive review:
https://www.happycow.net/reviews/vegan-hub-north-west-london-226804
Apart from that, Happy Cow also shows nine vegetarian Indian places around the area, which I likewise can't recommend, but it certainly looks as if you'll be a bit spoilt for choice.
I'm away overnight for work this week. Staying in exotic Wembley. Anyone got suggestions for decent places for takeaway dinner around there?