In the winter months we’re open from 09:00 through to 16:00.
When the clocks go forward we still open at 09:00 but we stay open later in the evening.
Until 19:00 initially, then until 21:00 in the middle of summer, and back to 19:00 at the end of the summer.
It all depends on when the sun goes down.
Full details are in this table.