Allen defeated Tompkin Gilbert on 29 October 1877, in London, England, for a title various described in British newspapers as the Heavyweight Championship of the world, the Championship of Britain or just the Championships, in a seventh-round
technical knockout. Gloves and the more modern
Queensbury Rules of boxing, adopted widely in 1865, were used in the match. While still in England, on 4 April 1878, Allen fought Charley Davis to for the heavyweight Championship of Britain in Cambridge, England, before a substantial crowd of 2,000, winning on a foul in five rounds. In a welcome change of events, gloves were used in the match, the newer Queensbury rules were followed for the first time in a championship match, and a British 200 pound prize was offered. Allen had a five-inch height advantage, and Davis was down in the first not long after a terrific blow to the neck. The fourth was fought viciously on both sides with blood streaming from Allen's nose, but equal damage being done to Davis, who went down after four minutes of fighting, ending the round. Davis finally went down in the fifth from a terrific right to his eye which ended the bout, and though Davis's supporters rushed into the ring claiming foul, the decision was for Allen.
Vacating English championship In his last professional fight, Allen again fought for the Heavyweight championship of England and a 400-pound purse against Jem Stewart on 22 April 1879 in London. The bout resulted in a 24-round draw and was fought with gloves using Queensbury Rules. The fighting was not brutal, lacking heavy blows to the disappointment of many spectators, until the seventeenth when Allen appeared to have a slight advantage. A large crowd attended, including several members of the aristocracy. Allen relinquished the Heavyweight Championship of Britain. ==Boxing retirement, and death==