Great visit to Waddesdon manor a national trust house and home to the Rothschild family. We always plan a visit near Christmas especially after dark as they always put on a great light show for the visitors. It only cost a few pound if your are a member of the NT, however plan your trip carefully it can get very crowded and there was a large crowd waiting for the bus back to the car parks. Please have a look at the entry in Wikipedia for more info I have also included a few links for your interest
https://en.m.wikipedia.org/wiki/Waddesdon_Manor
https://www.nationaltrust.org.uk/waddesdon-manor