OK, firstly, they will not let you on, if you have covered plates or no plates. They will also not let you on if the car is too loud or they feel its dangerous.
Videoing on the ring is prohibited, so you shouldn't end up on youtube as your not suppose to be filming, if they catch you filming you will be banned.
On all of the ring forums, pictures of crashed cars are not allowed, and most of the official Touristfahrer photographers wont take a pic of a crashed car.
As it is a toll road, insurance is a grey area, some people claim some not, the police investigate all accidents and if you are found to be at fault, you can be prosectuted by the german police, Therefore posting any vid of your crash or immediate pictures afterwards, may lead to these being used as evidence by the police.
You are not immune just because your from the uk and can go back home, if you do not have the money to cover damages, correct insurance and MOT etc, you CAN and WILL be locked in a german prison, until you pay. Despite many not wanting to claim, Nurburgring Gmbh will take your insurance details, if you do not pay there and then for armco and any road closure charges, they will call your insurance company, and you will be left with sorting this out with an unsympathetic insurance company later.
One more thing, Hire car companies now search the ring foto websites on occasion, and most now exclude the ring from coverage, If they find a pic of you there, which will usually include a picture of your face, then prepare for a bill of somekind.
All of the above were not mentioned by Clarkson and top gear, and everytime I visit theres lots of ring virgins there fresh from watching TG , stop watch at the ready. Go there and have fun, but with Bikes, buses, builders vans and practicing VLN racers, you'll never experience a more varied amount of traffic, and with plenty of blind crests and bends, be careful of whats waiting round the next one, and whats coming up behind you. Try and break clarksons record and stay on the line when you should move over and let faster traffic through, you risk an accident or a very very irate more experienced driver, coming to see you in the car park to have a choice word or two.