Campsites convenient for London

[Princess Doris]

I sometimes stay in central London but do so without the campsite facilities.
I have parked at the eXcel centre which is straight onto the DLR.
There's a few options on Park4Night, if you’re prepared to off grid and use showers and loos at a gym/ supermarket/ service station.
The benefit is you are in the city in 15 minutes.

Good idea. We are both members with David Lloyd, but we are in a campervan and really like to have facilities.