Carlin, the Commonwealth 200m Free silver medallist, swum to victory in 8.24.42, the fastest time in the world this year and it was just the start to the season she wanted.
“I’ve been training really hard and it has paid off with a best swim,” said Carlin. “I’m a determined person and although last year was disappointing for me, I knew there was more to come and I have been working hard.
“I’ve had my tonsils out which has been a big help as I’ve struggled with related illnesses in the past.
“I’ve been working really well with my coach Bud (McAllister) and I think we have got the best out of my training.”
Siobhan-Marie O’Connor of Bath ITC smashed her English record to take the win the 200m IM.
Coming home in 2.10.53, O’Connor swam a dominant race leading from start to finish in the second fastest time in the world this year.
Hannah Miley of Garioch claimed silver in 2.11.59 and Sophie Allen of British Gas Bath ITC was third in 2.13.33.
O’Connor said: “I’ve been training quite well and I’ve been to an altitude training camp. It was hard at first but I have really felt the benefits since I came back down.
“It is good to produce such a good time so early in the season, it gives me a lot of confidence for the rest of the year.
“The good thing about the Medley is that I get to train in all four strokes. Obviously I made the Olympics in the Breaststroke but I want to keep my options open in terms of events for the future.”
Joe Roebuck won the 100m Fly in a new personal best time of 53.07. He beat off challenger Joeri Verlinden of The Netherlands and Anthony James of Plymouth Leander in 53.65.
Roebuck was in seventh place at the halfway turn but had a strong final leg to overhaul the field to touch the wall first.
“It was a PB so I am very happy with that despite splitting my suit,” said Roebuck. “My priorities have changed and I’ve dropped the 400m IM.
“I will carry on looking towards to 200m IM and the Fly is obviously a big part of that.
“I’m really happy with how well things have moved on since I moved to Bath. I was at Loughborough for nine years and I felt like I needed a change and the move has freshened me up.”
Robbie Renwick was victorious in the 400m Freestyle in 3.49.91, holding off James Guy (Millfield) who finished second in 3.50.43, and Ieuan Lloyd of City of Cardiff, who was third in 3.52.35
“It was a good swim,” said Renwick. “I’m chuffed with that mid season. I felt good this morning and I knew I could go faster.
“I’m delighted to go under 3.50 at this stage. I’ve been on a training camp in Florida and I think that has really set me up for this.”
Chris Walker-Hebborn dominated the 200m Backstroke final, leading from the gun to take the title in 1.59.06.
Craig McNally of Warrender was second in 2.00.58 and Calum Jarvis was third in 2.00.94.
“It was a tough first swim but I’m happy to take the win,” he said. “It is the second time I have been to altitude and it was the hardest three weeks of my life but if it gives me the kind of result I got today I won’t complain.
“My goal for the season is to make the world championship team, it will be a big ask as the time is tough but I believe it is in my capabilities.”
Double Olympic- Champion Ranomi Kromowidjojo won the women’s 100m Freestyle ahead of Dutch teammate Femke Heemskerk and Loughborough’s Francesca Halsall.
Halsall said: “I raced last weekend and swam ten swims in three days so I felt tired today. I’ve been trying different strategies for the 100m so my expectations were lower, it is a work in progress at the moment.
“We’re trying new things and there is still a lot of work to do. It’s been a big and hard block of training and I’ve got two more events this meet.”
Olympian Georgia Davies won the 50m Backstroke in 28.04 ahead of Lauren Quigley who was second in 28.40 and Jessica Fullalove was third in 29.05.
Ross Murdoch won the 50m Breaststroke in 28.12 ahead of Mark Tully in 28.17 and Adam Peaty in 28.23.
Paralympic champion Jessica-Jane Applegate broke the her own S14 British Record to take victory in the MC 100m Freestyle.
Having broken her short course 100m British Record last week in Sheffield, the 16-year-old repeated the feat in the long course pool clocking 1.00.99 for gold.
S14 swimmers Chloe Davies and Natalie Massey finished second and third respectively in 1.04.41 and 1.04.45.
Paralympic champion Jonathan Fox claimed gold in his main event as he set 1.11.14 for victory in the MC 100m Backstroke.
The S7 swimmer said: “I’m really pleased with that race. It was a second faster than I went in Swansea recently so things are looking good for the World Championship qualifications.
“I’m trying to focus on the 400m Freestyle and the 100m Backstroke at the moment. Unfortunately I lost my 400m Free record in London so I want to push to get that back but Backstroke has always been my best really.”
James Crisp (S9) claimed silver in 1.05.00 while S14 Jack Thomas took bronze in 1.06.57
Hannah Russell won her first gold of the meet in the MC 100m Backstroke. The Paralympic medallist set 1.10.00 for gold ahead of Applegate and Davies who touched in 1.09.35 and 1.10.18 respectively.
She said: “I’m really happy with my race. It was definitely a big improvement on this morning.
“I was just off my personal best pace but I’m still really pleased. Having two back to back swims is hard and a lot of us were in the same boat but I just tried to pretend it was like training where we do max swims with a short rest.”
Dan Pepper was victorious in the men’s MC 100m Freestyle. The S14 swimmer finished in 56.42 to hold off his training partner and fellow S14 Ben Procter in 56.53.
Third place went to S7 swimmer Josef Craig in 1.02.86.
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