That is so kind to point to my blog MillyMoo.
The address is
http://fromthepoolside.com and you can search by country and budget.
A reader had gone to the Fish in the Cotswolds following an article on the blog and posted a review. It might be a good one?
http://fromthepoolside.com/fish-hotel-review/
you can also to their more luxurious sister hotel Dormy House
http://fromthepoolside.com/dormy-house-hotel-review/
The one hotel that is not on the blog and might be good for you is Calcot Manor. It's 2h from London, has indoor pool, a creche, etc.. We found it a bit too noisy and being like in a nursery for a weekend but many families really like it.
For stylish family holiday ideas in hotels and villas with pools, visit https://fromthepoolside.com