Loughborough University swimmer Roebuck was almost a second ahead of the rest of the 400 metres individual medley field in the short-course event to touch home in 4min 03.29sec.

 

Chad Le Clos of South Africa took the silver in 4:04.19 and Kyle Whitaker of the United States collected bronze in 4:08.15.
 
Simmonds, a member of the Intensive Training Centre (ITC) at Loughborough, then set a European record in the final of the 200m backstroke to win in 2:02.01.

 

Australian Belinda Hocking took the silver in 2:03.07 and Shiho Sakai of Japan was third in 2:04.77.
 
Michael Rock, from the ITC in Stockport, lowered the British record twice on his way to winning bronze in the 200m butterfly.
 
He qualified fastest for the final in 1:51.57 before finishing third in 1:51.32 in the fastest final of all time.

 

Gold went to Brazil’s Kaio Alemeida in a world record 1:49.11 and Nikolay Skvortsov of Russia took the silver in 1:50.75.
 
 

Fran Halsall , also from Loughborough ITC, became Britain’s first woman to dip below the 24-second barrier in the 50m freestyle as she set two national records on the way to a fifth place finish in 23.96.

 

Sweden’s Therese Alshammar won the gold in 23.75.