Permanently moored at Swan Pier, on the North bank of the Thames, the Regalia offers one of the, if not the, most unusual drinking venues within the City boundaries.  This is definitely a pub, there is no pressure to sit and eat during lunchtimes, although during the summer months the barbecue offers burgers and chicken in a bun if  you are hungry.  There are two bars, one on the upper deck and one inside, both get very busy in the heat of the summer but remain quiet during the winter.  Why not  check the Tower Bridge lift schedule and enjoy the bridge lift from the upper deck and a jug of Pims (weather permitting).