The usual shop hours are Monday–Saturday 9–6 and Sunday 11–5. Around Oxford Street, Kensington High Street, and Knightsbridge, hours are 9:30–6, with late-night hours (until 7:30 or 8) on Wednesday or Thursday.
Many businesses are closed on Sunday and national ("bank") holidays, except in the center, where most open 10–4. Banks are open weekdays 9:30–4:30; offices are generally open 9–6.
The major national museums and galleries are open daily, mainly 10–6, and often they’re open late one night a week.