Great Britain pip United States for relay gold

Dan Wallace, Robbie Renwich and Calum Jarvis had kept the team in touching distance, and Guy powered home from third to first in the final leg.

The team clocked a time of seven minutes and 4.33 seconds to push the defending champions down to second.

Australia finished third.

"That was great," Guy, who has also won 400m freestyle silver in Kazan, told British Swimming. "It was a huge team effort. The guys set it up nice and good and I knew if I was top three I had a chance of bringing it back but I never thought we'd get the gold.

"It's the best British team we've ever had and this relay is definitely something we're going to look out for next year. It was all about staying calm and not getting too tense in the first 100m. You’ve just got to enjoy it."

Meanwhile, Commonwealth bronze medallist Andrew Willis was less than half-a-second shy of securing a ninth medal for GB as he finished fourth in the 200m breaststroke for the second consecutive World Championships.

The 24-year-old came home to touch just 0.42 seconds behind Hungary's Olympic and defending world champion Daniel Gyurta as Germany's Marco Koch took the title ahead of American Kevin Cordes .

There were some encouraging semi-final performances as Commonwealth champions Francesca Halsall and Ben Proud booked final berths in their respective 50m butterfly and 50m freestyle events.

Lizzie Simmonds was the only other Brit in action on day six in Kazan, touching seventh in her 200m backstroke semi final and 13th overall.