I think most of the city tracks in the game serve a purpose. R246 is a wide city circuit with decent variety, Rome is short but sweet and also rather scenic, the special stages are the only night-time city circuits (and both are acceptable circuits IMO), Cote D'Azur/Monaco is fleshing out the much needed RL circuits in the game, Madrid is a fun, narrow city course, and London... uh... is a narrow city course that isn't fun?...
... I would almost certainly remove London - we already have a narrow city circuit in the form of Madrid, and there's a shorter layout of Madrid as well if the original seems too long. Why do we need another city circuit that's even shorter and much more bland?