UK destinations with newborns and dog

[starsalignedforyou]

Hi there
Hoping for some inspiration!
We have newborn twins and a dog and would like to go away around September/October time. Twins will be 9 months old by then so still needing buggy and nappies and some formula milk I expect.
Pre babies when we stayed in the UK we would usually headed to the coast with our dog but I wonder whether people have any recommendations?
I have stumbled across Forest Holidays online which looks good, I like the idea of having a spa onsite where I might escape for a treatment for an hour or so...

Any tips on locations/ things that we should consider would be gratefully received!

Where are you, roughly? And how far away do you want to go?

I used to fly to Cornwall with my baby and my husband used to drive the car down. But you have two!

The Ickworth

@Malteser71 that would have helped if I'd have mentioned where we are!

We are just outside London. So commutable to Cotswolds, Norfolk, Suffolk etc very easily.

Just looking at The Ickworth @Fivemoreminutes1 WOW!!!!!