For toddlers and teens in winter

Personally couldn't think of anything worse than Centerparcs.
Is there a reason you want to stay in the Uk? I never really understand why people say that when it's often cheaper to fly to Europe, and it means your kids get the added benefit of exploring the world.

A nice cottage with a wood burner and hot tub somewhere you could wrap up and do bracing walks and wave jumping. Harrogate with Brimham rocks, Cowes with Osborne House, Ironbridge area.

If you're after a good pool, look at Parkdean Ruda or Trecco Bay.
Bluestone in Wales and Warmwell in Devon are also very good options.

I don’t blame you for wanting to stay in
The UK to make the most of your break and that many flights will be costly at half term. If you only have 3 nights OP where are you based and how far are you prepared to travel to make the most of it?

Northumberland is lovely beautiful scenery lots of walks and castles to keep you busy during the day hire a cottage with a warm fire at night try Coastal Retreats or Grace Darling Holidays.

Keswick in the Lakes, Edinburgh, York, Chester, London, Ireland etc etc.

What do you all like to do on holidays?