The Dosti Luncheon Club at the Indian Community Centre in Sherwood/Carrington is a great place for a cheap lunch if you happen to be in the area. For £3.70 (with discounts for children/OAPs) you get rice, two curries and chapatti. Make sure you ask for the vegetarian option when paying. At the food counter, make sure you tell the ladies serving that you are vegan and don't want dairy. The normal chapattis have butter on them but they have some without. There may be yoghurt and a (milky) pudding as part of the vegetarian meal which you can refuse - even without these, it's great value for money.