Static caravans abroad can be hard to insure in the UK and you would generally need a specialist insurance company to provide you with insurance. In general you would be better off looking for insurance for your static caravan with an insurance company that protects and offers insurance for holiday home. Having a home away from home abroad has many benefits over having one in the UK. For one the weather is general a great deal better. Finding insurance however when in the UK can be difficult, but not impossible.
Generally when insuring static caravans abroad you would want to have a 24 hour helpline and that helpline should be manned by someone who speaks English. So this is always worth checking with the insurance provider before taking out your policy. You would also be better off if the insurance provider offered an interpreter to avoid any confusion if a claim had to be made and the third party involved in the claim only spoke their own language.
In general the caravan would have to be sited on a registered site and it would have to be under a certain age. There could be other limits so checking the small print is essential of any policy you are considering.
If you rent out your caravan then you should check to ensure that insurance for static caravans abroad included a loss of rental income. If your caravan was to be damaged and you could not rent it out then you could lose out on a large sum of money. If you had insurance for a loss of rental then you would be able to make a claim on the insurance to get back some of the lost rental income.