Saw a post on FB, frickley off road center, looks like could be a fun day out sometime next year.
Unless of course someone knows of others..

Frickley is up near to Simon, there's also Devils Pit (http://www.devilspit.co.uk/offroad/) just north of Luton. Tried it once in the LSE which is when I discovered it had a busted rear half shaft so was front wheel drive only. It's on clay though so gets a bit slippy when wet, my two wheel drive Classic had to be towed up a very gentle slope by an old Lada Niva......

Looks like fun :) As long as there's bacon sarnies I'm in :)

David, Rutland Rover, does some off road events for road legal cars so he may have a few more suggestions.

The off roading I do is on private land with a Land Rover club.

We have to pay the land owners for use of the land, usually around £200 for the weekend and we're not allowed to "damage" the land. We do a mix of TYRO, RTV and CCV trials. Trials are a series of gates you have navigate through without stopping for any reason and score points. TYRO and RTV would be suitable for P38s as they're non-damaging to vehicles. CCV trials are nuts. Those are for dedicated, modified cars that aren't road legal. They must have things like roll cages etc.

It's very different to what you find at pay and play days. There's a lot fewer big muddy hills and water splashes etc.

As for pay and play locations I'm not familiar with many. I know Tixover near Peterborough (used by the Peterborough Land Rover show) and Avalanche Adventure in Sibbertoft. I've never been to Avalanche though.

Just had a look at the avalanche site, same sort of thing, £200 hires the site for the day, lots of different sections, some winch only, might be something for the future, let’s have some input from people..
I also looked at Europe , but a couple of grand pp seems a bit steep.