I am an IAM Member and use their insurance service thru a company called Adelaide insurance in Belfast.
They also insure my wife who is non IAM and will haggle over a price.
They ask for a total value of bike with all extras and then give you a price - mine with the handguards, scottoiler, heated grips, sump guard, top box, spots and hugger I valued at �4999 - over �5k is a higher premium.
With breakdown cover and all the bits �126 fully comp.
http://www.adelaideinsurance.com/