Insurance cover for log cabin shed

[Colden Common Shed]

We in the Colden Common Shed are currently building new premises in the form of 3 log cabins on a wooden base. When we approached our current insurers (Zurich) to add buildings cover, the quote received was 5 times current premium. They seem to have been scared off by the wooden construction.
I know there are other Shed's out there using log cabin construction. Any advice on who the got their insurance cover from would be most welcome. We have already approached Ladbrooks at advice of UKMSA, but await quote.
Steve Badham, Secretary of the Colden Common Shed. (07407444474, [e-mail]).