JACOB Peters can expect his second international call-up after a stunning success at the British Championships in Sheffield.

The 16-year-old stormed to victory against mostly older swimmers in the 200m butterfly junior final – then backed it up by reaching a star-studded men’s final in the 50m fly.

Peters and Poole team-mate Jazz McCrea, 15, were in the form of their lives at Ponds Forge, breaking 10 Dorset records and recording 12 PBs between them.

But it was Peters’ four-length butterfly final that really caught the eye.

After qualifying as second junior from the heats, he tracked Florida-based Mason Wilby for 150m before powering past over the last 50.

It was a spectacular surge and his time of 2min 00.65sec gave a victory margin of 1.5sec and shaved 0.04sec off fellow international Jay Lelliott’s Dorset senior record.

Peters was a year younger than the swimmers placing second to fifth and the victory guarantees him selection for either the European Junior Championships in Israel in June and July or the World Junior Championships in Indianapolis, USA, in August.

Either will be a major step up from his international debut with an England youth team last month.

In the 50m fly, Peters lowered his own Dorset record to 24.76 in the heats to leapfrog the junior final and become the only man aged under 19 in the open showdown.

As Commonwealth champion Ben Proud blasted to a British record and the world’s fastest time this year (22.80) in lane four, Peters in lane eight was on course to move up the rankings again until a poor finish left him eighth in 24.91.

He was also fourth behind three older swimmers in the 100m butterfly junior final (55.07) after clocking a Dorset record 55.05 in the heats, and 10th and 23rd in the junior 50m backstroke and 100m freestyle respectively.

McCrea recorded seven PBs in seven races, reached three junior finals and broke seven Dorset records, three of them in one event.

This was the 50m butterfly in which she lowered her own county junior record to 27.93 in the heats, then toppled both that and former British champion Alex Savage’s senior standard from 2005 with 27.55 in the junior final.

Savage’s junior 100m butterfly record also fell as McCrea clocked 1:02.46 in the heats, then improved to 1:01.74 in the junior final – a PB by almost two seconds.

McCrea also set new Dorset junior figures with 26.62 in the 50m freestyle, eclipsing a standard set by Amelia Maughan as she won gold and silver at the 2009 European Youth Olympics, and 2:22.31 to lower Beth Aitchison’s 200m individual medley mark from 2013.

Poole coach Barry Alldrick said: “Jacob and Jasmine were superstars. They’ve delivered the best week of my coaching career.”

Swim Bournemouth’s Jay Lelliott, swimming for Bath University, missed selection for the World Championships in July after coming fourth in a world-class 400m freestyle final and eighth in the 200m backstroke.

Only the first two in each were eligible for selection.

His 400m time of 3:48.48 shaved 0.02sec off the PB that won him a European bronze medal in 2014, the year when he also made a Commonwealth Games final.

Lelliott, 22, whose training has been disrupted by illness, said: “I wanted to make the team but I knew it was a big ask.

“There’s so much more I can do, which is exciting. I’m going to work so hard now to put everything right.”

Bournemouth Collegiate School’s Dorset breaststroke champion Kayla van der Merwe, one of the youngest in the championships at 14, lowered her 50m PB to finish 10th out of 35 junior swimmers aged 14 to 17.

Team-mate Izzy Pryce was 30th in 34.67.

Van der Merwe, making her debut at this level, could not maintain her form in the 100m and 200m, in which she was 30th and 40th junior.