I think/hope you might be over reacting... I think that's Noble Marine excluding themselves from paying a share of the bill if you're to blame for a road traffic accident. If you're not covered for third parties on the motor insurance they'd have to put a ban on trailers as part of the policy. Not that its ever a bad thing to double check, insurance companies being what they are...
Jim - I reckon you're right. I've looked at this again, particularly after noting that Graham's policy also excludes Third Party liability during transport by road. Noble are only excluding
Third Party liability during transit by road. Section 1 of the policy ("The Insured Property"), insures against "All risks of accidental loss or damage". Whilst it doesn't specifically mention trailing, nor are losses incurred on the road specifically excluded in "Exclusions" either. I looked up my car insurance policy (Aviva). They do insure me for liability to Third Parties caused by my car
"and any trailer" (presumably including ones with boats on).
So if the guy in the Bentley drives into the back of my boat (his fault), then I can claim repair fees from Noble, who will in turn retrieve the costs from his car insurer. On the other hand, if I reverse the boat into his parked Bentley, smashing up the front of his car, and crush his legs in the process since he happened to be sitting on the bonnet at the time, and he just happens to be a professional footballer, Aviva will pay for the repairs to the Bentley and the £10million damages claim for personal injury and loss of earnings. Noble will pay for the repair to the gantry on my boat. I think.
Might be safer to take up golf.