With it being so easy to SORN & tax a vehicle online then I can imagine quite a few people chancing it. If you are going to be on a campsite for a month or more (some people seem to do this) then I don't know how you would stand. I would think that you could SORN it for the time you are off the road but not sure what the situation is regarding
insurance. Can be insured & covered if my van is on the drive without tax? This is something for somebody who enjoys reading the small print on your policy. I always SORN my car if we are away for more than a complete month, doesn't save much but it's so easy, saved £20 on my last trip by doing this, re-taxed the car while we were waiting at Eurotunnel to come home.
Was on the long ferry back from Spain one year & speaking to a guy with a caravan who said he always SORN's his car when he leaves the country. Wonder if they check UK registered cars to see if they are legal when entering the country, with the automatic number plate cameras I would think it is easy enough to do.