Campsite around London, allowing drinking

I’m organising a camping trip with some friends and am looking for a campsite accessible from London (maybe a train ride away), that is relaxed enough to let a group of people drink.

Does anyone know of such a campsite, or what areas are best to look for campsites nearby London, accessible by train?

I can't see why any would want to ban you from drinking, provided that you weren't obnoxiously drunk

Try looking on Pitchup.com for farm campsites. They're probably what you're after. For example, this one is close enough to a train station:

http://www.pitchup.com/campsites/England/South_East/Surrey/Lingfield/osney-lodge-farm/

the issue is not the drinking, as I think you realise. The issue is a bunch of loud kids guzzling booze and shrieking and vomiting all night.

if you can hold your drink and keep the noise down after whatever time the site specifies, no-one will mind.

Could have a problem if your group is mostly male - though in my experience cackling hen parties are far worse

most places don't like single-gender groups of either kind - for just these reasons!

There is a place called Theobalds Park Camping & Caravan Site
located at Theobold Park Bulls Cross Ride, Waltham Cross EN7 5HS
I think it will help you to camp successfully.

As a Brity I'd be extremely unhappy, if I wanted a few beers and some finger wagger turned up and told me I couldn't booze. He'd have a one man riot on his hands.

On the other hand I don't go on the rampage when I'm drunk, I tend to have a kebab and then pass out. So a previous answers suggest, it'll be fine as long as you are able to hold your drink. If not then you won't be very popular ANYWHERE in the UK.