Tai, who competes in the S9 classification, led home a podium sweep for the hosts in the women's 100 metres backstroke as she touched the wall in 1min 07.66sec, beating the time clocked by Australian Ellie Cole at the 2015 World Championships in Glasgow.

The 18-year-old Briton's time saw her end on a points total of 1,045 points, with Paralympic champion Hannah Russell, an S12 athlete, second on 982 at the Ponds Forge International Sports Centre.

S8 competitor Stephanie Millward, who won two gold medals at last year's Paralympic Games in Rio de Janeiro, did enough for third on 980.

"I’m a bit shocked to be honest, I wasn’t expecting to swim the time that I did and it was a massive personal best as well,” Tai said. 

“I didn’t swim too great in Rio, so to be back on track and performing where I want to be now with the rest of the season still ahead, it’s crazy.”

Firth broke the world record in the women's 100m butterfly S14, a non Paralympic event, in the heat and then managed to go even quicker in the multi-class final as she touched the wall in 1:04.62.

Victory in the race went to S13 competitor and Paralympic champion Rebecca Meyers of the United States, who secured her second win of the meeting in Sheffield in a time of 1:04.70.

The American scored a total of 934, with Shokhsanamkhon Toshpulatova of Uzbekistan second on 900.

Tai clinched bronze, while Firth came through in fifth place.

“It was a great race," said Meyers, who won the women's 200m individual medley yesterday.

"I felt strong going out and I knew I had to bring it home and I did.

“It’s just the beginning of the season so to be doing these times, it gives me great confidence.”

Uzbekistan’s Dmitry Khorlin set an 100m butterfly S12 Asian record on his way to gold as he clocked 59.21sec in the final, giving him a total of 884.

Britain’s James Hollis, who participates in the S10 category, earned silver on 862, with team-mate Stephen Clegg sealing bronze on 812.