iv just redone my home ins. with The Co-Op
Policy covers bikes up to £1000 as standard (at home)
I added the marin and valued it at £2000
The c456 @ £1250
and added away from home cover for personal possesions, covers both bikes listed and my other bike (vitus road bike £600) also mobiles/laptops etc etc
and it cost about £65 on top of the normal policy, bikes are covered for theft and crash damage, by the looks of it the only things not covered are tyres/tubes.
hope i never need to claim but feel a bit safer knowing they are insured.