Sue2 - I don't know whether you particularly want a hotel, but we have just come back from a great place in Nth Devon.
It's called Hill Farm, and is on the edge of Torrington (10 miles inland from Westward Ho/Barnstaple. It's a non-working farm, run specifically for children. My dd is 20mths old and had a great time. Sheep, a cow, a goat, rabbits, ponies, chickens, geese, ducks, donkeys, you name it they've got it. Animal feeding twice a day, tractor rides, indoor heated pool (very relaxing), indoor games room, outdoor playground, need I say more.
Accomodation is in self catering cottages, (clean and nicely furnished), fully equipped with microwave, Fridge freezer etc, highchairs, stairgates etc. The couple who run it also have two daughters who babysit if required (21 and 23 I think). I sound like an advert I know, but the place was so good that I think more people should know about it.
During our week there, we didn't leave the farm for three days because we didn't need to! Granted we had good weather, but there is indoor stuff if you don't. Hope this helps. Get back if you want a number.