BRIXHAM, England — In the pitch black of early morning, huge waves hurled the 30-ton vessel from side to side, drenching crewmen who struggled to keep their footing as they cast the trawler’s nets into the swirling seas.

But, once back on the bridge, the skipper, Dave Driver was oblivious to the stomach-churning motion of the boat, and dismissive of the perils of his work — even as he recalled once falling overboard and, on another occasion, rescuing two fishermen from drowning.

“I’m my own boss, I do what I want, I think it’s the best job in the world,” said Mr. Driver, who left school at age 15 but now owns the Girl Debra, which is worth 1.2 million pounds, about $1.5 million, and is named after his wife.

He has only one major gripe in life: the French.

Mr. Driver thinks French boats are allowed to take too many fish too close to the British coast — touching on a deeply emotional issue on both sides of the channel that could dash hopes of a post-Brexit trade deal between Britain and the European Union.