Agree with NoS.
was for sale last year in a bit of a shabby state for £1300ish. A newer boat with a proper SR4 centre console, newer, better engine and a decent road trailer. It needed a bit of repair work to the bow tube and a bit of tidying to the hull gelcoat. I nearly bought it at the time, but my SR4.7 came along, so I bought that instead, as Ms DHD convinced me that you actually can have too many RIBs
Anyway, my point is that the Mariner F25 is probably worth around £1200ish, but the whole boat outfit with trailer & engine as it is wouldn't get that much. gibbo on here bought a half tidy SR4 on trailer for £500ish, so I reckon the boat and launch trailer will only get around £300, given its problems.