Comment by woodylondon

Sky Garden is really the only one that does not make it hard. No need to book - just pop up there for with your sandwiches for lunch, and I think it's the best roof garden in city.

You might need to queue for a little while on a weekend or at prime lunchtime.

The others you need to book weeks ahead, so agree with the previous post that they do make it hard. Sky Garden is not one of them.