Wolverhampton's Craig Fallon struck gold for Britain in the World Cup meeting in Warsaw.
The 22-year-old, who won silver at the world championships two years ago, won the -60kg category event.
Fallon suffered second-round elimination in the Olympics in Athens last year but won bronze at the Super World Cup event in Paris last month before overcoming Cedric Taymans, of Belgium, in the semi-final and then Salamat Utarbayev, of Kazakhstan, in the final. He won both of his last two bouts by Ippon.
Sophie Cox, an Olympic quarter-finalist, was second at the women's event in Tampere, Finland, losing out of the -57kg event to 2000 Olympic champion Isabel Fernandez, of Spain.
Berkshire's former European champion Georgina Singleton, a late addition to the team, won bronze in the -52kg class while Samantha Lowe took another bronze at -70kg.