cheap UK holiday inspo needed please

[Ricecakesaremyjam]

PLEASE could anyone shout ideas at me for holidays in the UK with 2 young kids (5 & 7)
5yr old is autistic, looking for something cheap and cheerful and ideally not a 75hr car trip 😂 (we are in the south east)
Thankyou!

What time of year and what is your budget?

A caravan park might be your best bet as come with entertainment and a pool.

In the summer, probably June-July before the holidays as the prices will obviously go up.
Would anyone recommend Butlins/Haven/Pontins type holiday camps? Or any other less well known camps that I might not have heard of? CenterParcs would be lovely but too expensive.