I went with my brother to visit the gardens at Brodsworth Hall yesterday - it was free admission as part of English Heritage's Open Weekend.
We've never been before, but really enjoyed ourselves for about ninety minutes; the highlight being the formal border consisting of 1920s varieties of many popular garden plants.
We also saw something that we'd not seen before - people playing croquet on the lawns.
LissaT
Pro 
I told you that it was worth a visit.