It’s a Quaycraft 1/48 Scale 20ft motor cutter with clinker hull and transom stern, from
www.model-dockyard.com (Price GBP 15.80 + VAT).
Quaycraft produce a huge range of ships’ boats in every scale from 1/192 to 1/24 and across many periods. They're highly detailed and beautifully produced resin models with brass fittings, and not much more expensive than equivalent wargames models. (Except similar wargames products tend to be pretty poor quality in comparison

).
These are beautiful scale models designed for serious model ship enthusiasts. To this end, they are complete, not waterline models. So you have to sand the bottom down if you want to use them on the tabletop – which is what I’ve done with this one, although it seemed a crying shame to sand away so much wonderful detail… I’ve also left out the very nice inboard seating in favour of the practicalities of standing figures up inside the craft.
Model Dockyard by the way, stock a whole load of different ranges of scale ships, boats, fittings and accessories (I got the lifebelt from there too) and were extremely pleasant to deal with. And quick.