I'm going to London tomorrow but my appointment should be finished by midday. My train home is booked for 7pm so I've got quite a lot of time to fill. I was thinking of going to the National Gallery as there's an exhibition I'd like to see. Also a visit to Uniqlo is on the cards. I know London quite well but I'm usually there with the kids rather than alone. Any ideas what I can do and where I'd feel comfortable eating alone? Thanks