The museum is open 9.30-5.30/6 7 days a week March to October after that time not quite sure.
As for the admission if someone had enough money the museum could have got there own land and then charged what they wanted. We must be greatful to Pete Sampson for letting the museum have the land otherwise this museum would never had happened.
Please also remeber that the museum is a charity so when you have looked round any change you have in your pocket put it in the pot on the counter.