Glasgow has one (twinned with Nuremberg).
Birmingham has one (twinned with Frankfurt).
Leeds has one (no idea who they're twinned with).
London - bloody capital city has nada.
Oh, sorry, unless you count the utter crock of shite that is the Southbank "German-styled" market: nothing authentic about it whatsoever, no German stall holders to speak of, but the usual Christmas tat only sold from a wooden chalet!
I WANT A GERMAN CRISTKINDLMARKT IN LONDON PLEASE
Over and out.