If you had most of a day to yourself in central London, what would you do? I have done main tourist things before. I want to do a bit of shopping like Uniqlo that is only in London, so I guess that means central (Oxford st/Regent st) but could easily get anywhere else. Happy to browse other shops for a little while (clothes, books) if they are shops I don't get access to in person much, like Uniqlo, but that area is always so busy for shopping and puts me off, and I'm not planning on buying much, so want to go elsewhere as well.
I enjoy museums, exhibitions, history, classical music, ballet, etc. Less so art galleries, though sometimes for specific exhibitions. I often see places to go or stuff to do advertised on in London when I'm not able to be there, but can never think of it when I do have an unexpected chance. Half term tends to be full of a lot of activities for children, which aren't always good for a lone adult - e.g, I haven't been to the science museum for ages, but not sure half term is the best time! Some of them might be good though if there's anything different or new; or free outdoor events/displays/lights.
Too late to book to go up to the Sky Gardens, which was on my list some day.
I might do one of the walk in back massages at Neal's Yard. Or find an interesting but not crowded cafe for lunch or afternoon tea, though I feel a bit odd on my own in some places.
What would be your perfect afternoon? (or indeed evening; I'm then free to stay as long as I like, from about 12pm), but relatively limited budget wise so not buying expensive tickets or meals!!