Ordit focuses on central London. Delivery is mainly available across these postcodes:

E1, E1W, E14, EC1, EC2, EC3, EC4, W1, WC1, WC2, N1, N1C, NW1, SE1, SW1.

This isn't a hard boundary — where it's feasible and viable, delivery to other postcodes may be possible, so it's always worth checking a specific address.

To check whether a specific address is covered — and see which vendors deliver there — see "Finding restaurants that deliver to your address".