The best thing is the year and a day validity of t...

The best thing is the year and a day validity of the day tickets if you live within reasonable travelling distance. There's a lot to do and see if you have to pack it all in to one visit. We only spent a couple of hours there and mainly enjoyed the walk about, the gardens and the birds- but look forward to going back again and again and doing different things, and the price then seems very reasonable. Not so sure how I'd feel if I was paying for a single visit though.