Just to let you all know Halifax seem to do a very good deal. They have contents insurance thats unlimited in value..cost for a year for me was £160. All bikes up to £500 are insured as part of the policy
£60 extra for the year and that includes storage in an outside shed(when the missus complains about it being in the bedroom!)
Plus you can use the bikes abroad for about 60 days a year as prt of the policy also
You may have to phone rather than do online as you need to add any expensive bikes as specified items