Wookey Hole is dreadful. We went in May and I was REALLY disappointed (ds1 - 4.5y, ds2 - 16mo at the time). The caves weren't very good, and were a bit difficult with the 16mo. The dinosaurs were ok, but only ok - and ds1 who is dinosaur obsessed had had enough after about 30 mins there. The only other thing that attracted ds1 was the penny arcade which took old pennies that had to be purchased for 5 for 50p. We paid with Tesco vouchers and if I had paid full price I would have been really pissed off. The soft play isn't that decent - and if that's what you wanted you might as well save your money and go to a proper soft play. If you do go don't eat there, the Big Top Restaurant was crap.
not been to Cheddar for yearsso can't comment.