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It only effects renewals or new cover. I wonder if those about to renew have been informed? I have already arranged cover elsewhere as I am soon to renew. If I had not already decided to jump ship I would have done after that announcement. It is one thing to impose that on new business but, in my view, not on to impose it on existing policies at renewal
Back to the OP, one tip from my days in the 70/80s caravaning on seaside sites in Italy with their soft sand pitches-always carry a towrope with you that way you can have the car on solid ground and pull the caravan free. Make sure you have someone to help guide the caravan.