Thanks for replies, looks like we are all in the same boat doing what we can to protect our belongings, and trusting to luck we don’t get unlucky, and if we are unlucky then hoping the insurance is as good as it says it is. No magic wand or one security device to protect us against the unscrupulous people who would rather take something rather than own it by their own hard work.
luckily I do have decent Cctv, hitch and wheel lock I may try and get some removable bollards made up ( ones that can be set a decent depth in the ground for an added visual and noise deterrent) I think I can get the house alarm extended to cover the caravan as well .
i will also check with the insurance company see if they have any additional advise.
again thanks for your comments.