The event, which incorporates the trials for the IPC Swimming World Championships in Eindhoven and the trials for the Commonwealth Games, saw Welbourn broke the S10 400 metres freestyle European and British record. 

He took on Brazil’s Andre Brazil in the final and they fought for the lead throughout the first 200m of the race.

Brazil had a strong start but Welbourn kept on his shoulder until the halfway point when he began to move into the lead.

Welbourn took the victory in a time of 4min 07.05sec and gold with 966 points.
 
He said: "I swam well a few weeks ago and so I knew I was on for good times here.

"I felt good throughout and even though it did hurt I don’t feel like I slowed up through the race.

"Every time I take on Andre [Brazil], it is a good race. I know he has more speed at the start than me and I have a strong back end so it is down to whether he gets enough of a lead over me. But today I had enough to take the race.

"I have made the qualifying time now so the pressure is off me a bit. I am also aiming to qualify for the Commonwealth Games in the 100m freestyle and if I do I will get a lot of confidence out of that."

Welbourn’s club-mate Sam Hynd, who competes in the S8 category, won silver with a total of 955 points after touching in 4:30.35 and Newquay’s Jonathan Fox - S7 -  took bronze in a time of 4:57.94 and a total of 945.

Double Paralympic Champion Eleanor Simmonds won her first medal of the competition in the women’s 400m freestyle.
 
Simmonds, who competes in the S6 category, got an excellent start alongside her club-mate Fran O’Connorbut the world record holder showed her skill as she moved ahead.

In the final half of the race Simmonds (pictured) settled into her pace and touched home in a time of 5:32.03 and won gold with a total of 1086 points.
 
She said: "I really wanted to go under 5:30 here today so I am little bit disappointed but it was still a strong swim for me.

"I have achieved the qualifying time for the World Championships and that is great.

"I was only just 12-years-old when I went to the 2006 World Championships in Durban and it was the first event to give me international experience so I am looking forward to competing in a World Championships again.

"Apart from the Paralympics this is our biggest competition and I am going to focus now on making sure I am ready to race.

"I think the experience from Durban and the Paralympics will help me in Eindhoven this year."
 
The silver medal was won by New Zealand's Rebecca Dubber with a time of 5:35.47 and a total of 844 points.

World short course champion Natalie Jones won the bronze medal with a total of 820 points after touching in 6:04.70.

O’Connor broke the S7 British record with a time of 5:40.50 as she finished fourth.
 
Newquay's Ben Procter broke the S14 100m backstroke British record twice throughout the first day of competition.

First, he lowered the record to 1:06.77 after a strong heat swim but went into the final hungry for more success and fought to ensure he beat the qualifying time for the IPC Swimming World Championships.

Proctor enjoyed an excellent start to the race and with an excellent turn extended it through the final 50m.

He touched in a time of 1:06.22 and won the gold medal with a total of 894 points.
 
Procter said: "It was really good to break the record here.

"I have been working really hard on my backstroke since the British Gas Swimming Championships.

"My coach actually increased the volume of my training to make sure that I could get the times.

"I really wanted to get my PB a few weeks ago but I missed it so I am really happy today."
 
Paralympic medallist Anthony Stephens broke the S5 50m freestyle British record on his way to his first medal of the competition.

The double European champion swam a well timed race as he touched in a time of 34.30 to take almost half a second off the British record.

He won bronze with a total of 860.
 
The victory went to Brazil's Daniel Dias with a time of 33.34 and a total of 937 with silver going to Itzhak Marnistvalov, of Israel, in 1:07.05 and 893 points.
 
Nova Centurion's Charlotte Henshawlooked strong in the SB6 100m breaststroke as she took battled against Bath University's world record holder Elizabeth Johnson for the victory.

Johnson and Henshaw have continued to have a friendly rivalry for a number of years and Johnson pushed Henshaw all the way to her victory.
 
Henshaw touched in a time of 1:39.71 with Johnson finishing in 1:40.35 but Henshaw took the gold with a total of 1011.

Johnson took silver with 992 points.
 
Henshaw said: "That was a really good race between us.

"I felt really strong and I have been working on my final 50m because I have the speed from the start but needed to work on keeping the speed up.

"I think it went well tonight.

"It is really good to have Liz [Johnson] to race against; she really pushes me on.

"It is good to have depth within the category so we challenge each other which helps me."