I eventually spoke to someone at Hiscox, and had a lengthy conversation all seems pretty straight forward, all on-line comes about around £250 classed as art. The only "proper" laid up quote I've received so far is around £900! Still waiting for DI and Bemoto to come back to me, given the current policy runs out at midnight tomorrow I think I'll be going with Hiscox at this moment.
Yes, it's a good option I think - I've been searching for objet d' art insurance for a few years now for bikes and finally stubbled upon this