It seems the chance of a proper repair is pretty small.
Reply from Humber this morning to my enquiry about getting orange gelcoat repair:
"Unfortunately due to flammability content we are not permitted to send this type of product in the post without a special movement certificate to accompany it. The last time we looked into this it was in excess of £200 regardless of quantity!"
I guess I can forget about getting any shipped here then. I've asked them what they recommend for repairing it given I don't exactly live within collection distance of the factory.
Note to self: next time buy an aluminium boat. With no tubes on it
Ho hum. Oh and somebody reversed in to the front of my 90 over the weekend. I think I'll stay in bed for the rest of September