Hi,
After a lot of research I solved our problem by joining the Camping & Caravan Club in doing so and taking out their Household/Building Insurance, we receive 180 consecutive days cover with NO restrictions (ie leaving central heating on/weekly visits to check on property). Their quote matched my existing/standard Insurance quote with a £40.00 CC&C joining fee = £230.00 and not the £550 thru a broker.
Also, used their travel Insurance for 180 days @ £102.00 each with good cover and accepted for Residency Health cover.
Please appreciate we do not own a caravan nor go camping, we just take advantage of their services.
Regards
Brian.