Great Takeout or Delivery in Chelsea
You may find a couple of issues here, Olivia. Mainly that the kind of joint operating a takeout/delivery service would not often appear on an SW3/7 Hound's radar. Generally speaking, I don't think much food is improved by road transport. Inexpensive curries and pizzas will be easily found, but superior chow may have comedy prices, and be half as good as it would be in the restaurant. Sushi may be a bit of an exception.
Sorry I have no specific recs., but the above may be why you've had no replies. (I doubt if there are many SW3/7 Hounds at all, and they would have to live there to be of any help).