I forgot about this!
If you really like it hot and spicy, on Sunday 13th, head over to Gunnersbury Park, south Ealing for the annual London Mela, gathering of the Indian community. This is about 10 times bigger than the Korean festival on Saturday and a curry lovers dream. There are bands, dancing, rides, food, stalls selling anything and everything. This is a FREE event although if you park on site they do charge £5 I think, from what I can remember last year – if you park outside you may get clamped.
Nearest tube is Gunnersbury Park or Acton Town.