(fn s nn r lu hn zhi bo/monk's vegetable claypot with glass noodles and red fermented tofu) at Joy King Lau, Chinatown, London WC2

Kake Pugh has added a photo to the pool:

This is the one from the Chinese-only menu. There's a monk's vegetables claypot on the English menu as well, but I don't know if you'd get the same thing ordering from that.

Links:
Randomness Guide to London