F3G
220t for a 747-400 landing is on the light side, whereas I guess 66t for a 737 is towards max landing weight.
An empty 747-400 APS weight is about 175t. Add 400 pax and bags (40t) and freight (say 15t) and bare minimum fuel (10t) gives you 240t, which in my experiance is closer to the norm. Max Landing weight is 285t or thereabouts. Freighters will be heavier.
I have landed on 26R at LGW with zero wind and think I recall that we were at MLW at about 250t for that strip [several years ago].