During Owumi's hiatus from basketball, his family encouraged him to return to the game, as it was his primary passion.
Stanley Ocitti and Sherrad Prezzie-Blue, players who already knew Owumi, suggested that Paul James, head coach of the Worcester Wolves of the British Basketball League (BBL), look into signing him.
In the summer of 2012, the Wolves signed Owumi, who joined Prezzie-Blue in the back court.
James said, "[Owumi] distributes the ball well and will give us multiple options both on offense and defense."
The coach also described Owumi as a "tough-nosed player".
He had an immediate impact, recording a team-high 24 points, 5 rebounds, and 3 assists in his debut against the Durham Wildcats on September 22, 2012.
He had another strong showing on January 25, 2013, when he put up 30 points in a loss to the Surrey Scorchers.
On February 8, he led Worcester to an upset win over the Newcastle Eagles in a BBL Trophy quarterfinal with a season-high 34 points and 9 rebounds.
Owumi posted a double-double of 30 points, 16 of which were free throws, and ten rebounds in a loss to the Manchester Giants on March 23.
Through the BBL Championship and Play-offs, Owumi averaged 19.4 points, 6.6 rebounds, 3.9 assists, and 1.2 steals.
He was named to the BBL Team of the Week First Team on six occasions during the season.
He also garnered all-league honorable mention and all-defensive honorable mention honors.

On June 5, 2013, the Wolves announced that Owumi would be returning for another season with the team.
James hoped to build the team around him in their upcoming season.
Beginning early in the season, Owumi joined forces with Zaire Taylor in the back court.
On September 28, 2013, to begin his second BBL season, Owumi scored 18 points and added 2 rebounds and 2 assists in a 117–60 win over the Surrey Scorchers.
On December 1, Owumi scored a season-high 30 points to guide the Wolves past the Durham Wildcats.
In a rematch with Durham on January 10, 2014, Owumi notched 27 points to extend his team's winning streak to seven.
On March 31, he put up 11 points as the Wolves defeated the Glasgow Rocks to win the BBL Trophy.
In May, Worcester also claimed the BBL Championship title behind Owumi's 14 points and 6 rebounds.
By the end of the season, he was averaging 17.7 points, 5.7 rebounds, 3.4 assists, and 1.3 steals in BBL Championship play.

In July 2014, Owumi re-signed with the Wolves for a third season.
He commented, "It was an easy decision for me to come back to Worcester, the club and city support everything I'm doing on and off the court.
Next season should be exciting, I'm looking forward to building on it."
During the off-season, the Wolves had seen the departures of key players Taylor and Will Creekmore.
To open the season on September 26, 2014, Owumi recorded 10 points, 6 rebounds, 7 assists, and 3 steals in a win over the Newcastle Eagles.
On October 24, he scored a season-high 33 points, making all 6 of his three-point attempts, to beat the Leeds Force, 98–69.
Owumi became his team's all-time leader in three-pointers, passing Daniel Gilbert for a total of 169.
He collected 5 three-pointers in another 30-point game on December 14, as Worcester fell to the Cheshire Phoenix.
On April 26, 2015, in the BBL Play-off quarterfinals, Owumi posted a double-double of 18 points and ten rebounds, but the London Lions eliminated his team with a 106–67 win.
He capped the season averaging 16.4 points, 6 rebounds, 3.1 assists, and 1.1 steals per game.
During Owumi's hiatus from basketball, his family encouraged him to return to the game, as it was his primary passion. Stanley Ocitti and Sherrad Prezzie-Blue, players who already knew Owumi, suggested that Paul James, head coach of the Worcester Wolves of the British Basketball League (BBL), look into signing him. In the summer of 2012, the Wolves signed Owumi, who joined Prezzie-Blue in the back court. James said, "[Owumi] distributes the ball well and will give us multiple options both on offense and defense." The coach also described Owumi as a "tough-nosed player". He had an immediate impact, recording a team-high 24 points, 5 rebounds, and 3 assists in his debut against the Durham Wildcats on September 22, 2012. He had another strong showing on January 25, 2013, when he put up 30 points in a loss to the Surrey Scorchers. On February 8, he led Worcester to an upset win over the Newcastle Eagles in a BBL Trophy quarterfinal with a season-high 34 points and 9 rebounds. Owumi posted a double-double of 30 points, 16 of which were free throws, and ten rebounds in a loss to the Manchester Giants on March 23. Through the BBL Championship and Play-offs, Owumi averaged 19.4 points, 6.6 rebounds, 3.9 assists, and 1.2 steals. He was named to the BBL Team of the Week First Team on six occasions during the season. He also garnered all-league honorable mention and all-defensive honorable mention honors.
On June 5, 2013, the Wolves announced that Owumi would be returning for another season with the team. James hoped to build the team around him in their upcoming season. Beginning early in the season, Owumi joined forces with Zaire Taylor in the back court. On September 28, 2013, to begin his second BBL season, Owumi scored 18 points and added 2 rebounds and 2 assists in a 117–60 win over the Surrey Scorchers. On December 1, Owumi scored a season-high 30 points to guide the Wolves past the Durham Wildcats. In a rematch with Durham on January 10, 2014, Owumi notched 27 points to extend his team's winning streak to seven. On March 31, he put up 11 points as the Wolves defeated the Glasgow Rocks to win the BBL Trophy. In May, Worcester also claimed the BBL Championship title behind Owumi's 14 points and 6 rebounds. By the end of the season, he was averaging 17.7 points, 5.7 rebounds, 3.4 assists, and 1.3 steals in BBL Championship play.
In July 2014, Owumi re-signed with the Wolves for a third season. He commented, "It was an easy decision for me to come back to Worcester, the club and city support everything I'm doing on and off the court. Next season should be exciting, I'm looking forward to building on it." During the off-season, the Wolves had seen the departures of key players Taylor and Will Creekmore. To open the season on September 26, 2014, Owumi recorded 10 points, 6 rebounds, 7 assists, and 3 steals in a win over the Newcastle Eagles. On October 24, he scored a season-high 33 points, making all 6 of his three-point attempts, to beat the Leeds Force, 98–69. Owumi became his team's all-time leader in three-pointers, passing Daniel Gilbert for a total of 169. He collected 5 three-pointers in another 30-point game on December 14, as Worcester fell to the Cheshire Phoenix. On April 26, 2015, in the BBL Play-off quarterfinals, Owumi posted a double-double of 18 points and ten rebounds, but the London Lions eliminated his team with a 106–67 win. He capped the season averaging 16.4 points, 6 rebounds, 3.1 assists, and 1.1 steals per game.
Alex Owumi