I ended up booking this in with one of the outfits Steve Bruce from F-RIB HQ recommended, RIB Shop in Southampton. From the photos of the tear, RIB Shop recommended fitting an airtight internal patch followed by a shaped cosmetic external patch. They are also fitting a matching cosmetic patch on the other side of the boat for conformity.
The cost is £270. I'm paying the first £100, Craft Insure are covering the remainder. The way I saw it is the cost to me is about £50 more than buying a patch kit, but it comes with the peace of mind of RIB Shop's 12 month warranty and the assurance of a professional job keeping the value of the boat high should I come to sell it at some point in the future.
The downside is the earliest RIB Shop could fit the repair in was w.c. 18th June. Just missed a cracking weekend for boating weather and two more weekends to go before I get the F-RIB back








