Weird title but I’ll explain! Going to London to meet family members for lunch. One is elderly and feels the cold. We don’t want to have lunch and then just go home, but strolling about outside isn’t ideal as it will be cold. Where would you go to spend an extra couple of hours? Art gallery? Museum (I fear the latter will be heaving on a Saturday)? Family members are aged 18, 20, 80 and then a couple of middle agers.