Bring back a few of these: https://en.wikipedia.org/wiki/Fairmile_D_motor_torpedo_boat
I had assorted relatives in the Navy during 1939-45. None were in the coastal forces, not even on Dog Boats, but all thought that Dog Boat sailors were... insane.
Officially a Dog Boat could make 30 knots. Unofficially, more like 36. And a lot of Dog Boats took the twin Oerlikon 20mm off and replaced it with a Bofors 40mm, or 'borrowed' a 37mm from an American boat, or liberated one off a German boat. At least one Dog Boat had a quad 0.50 caliber mount, again 'borrowed' from the USN, who had 'borrowed' it from the US Army. Some of the 37mm guns that Dog Boats acquired were originally US Army Air Force property, the USN liberated them off of P-39s. HM Forces got them when the original owners came looking for their property and things got too hot for the USN's PT boat boys, who were also crazy but not nearly as crazy as Dog Boat men. The six pounders (57mm) were semi-automatic, the same basic weapons as fitted to Tsetse Mosquitos. Dog Boats would go toe-to-toe with Japanese or German destroyers and win. Not that there were that many German destroyers left by the time the Dog Boats arrived. Wiki, as usual, screwed up, and left off mention of the two to four 21" torpedoes some Dog Boats carried... If you look at the pix in the Wiki article, you can see a21" torp on MTB 459, there'll be another on the other side.