Len Constance won 3 caps for Wales (RL) in 1948–1951 while at St. Helens, and Dewsbury.
[1] Len Constance played in Wigan's victory in the Lancashire League during the 1951–52 season.
[6] On Thursday 20 January 1949, Leonard Constance was sold by St. Helens to Dewsbury for £2000 (based on increases in average earnings, this would be approximately £162,900 in 2013)[7] along with Harry Street who was sold for £1000, the £3000 raised, contributed to the £4000 St. Helens paid Belle Vue Rangers for Stan McCormick, Constance made his début for Wakefield Trinity during September 1952.
Len Constance was the coach of Dewsbury from Tuesday 10 July 1951, until 21-days later when he placed himself on the transfer list on Tuesday 31 July 1951, shortly after this he joined Wigan (as did fellow Dewsbury player; Harry Street) on-or-before Saturday 18 August 1951.
Leonard Constance taught at Rivington Road School in St. Helens, where another Welsh St. Helens player, Don Gullick also taught Leonard Constance's marriage to Elsie B.