He also represented Wales at international level 23 times during his career, scoring 6 goals Born in the Splott district of Cardiff, Davies attended Gladatone Road School.

[3] He joined Cardiff City in 1919 and made his senior debut in the 1919–20 season, replacing George Beare for a 2–2 draw with Luton Town on 13 September 1919 in the Southern Football League.

With Cardiff meeting Bristol City in the Football League on the same day, they were forced to field a reserve side for their match against Pontypridd.

[10] He was also prolific in the Welsh Cup, scoring four times against Newport County in the third round and adding a hat-trick against Merthyr Town in the fourth.

The match was goalless after 70 minutes, when a goal-bound shot from Gill was blocked by the hand of a Birmingham defender resulting in a penalty being given.

The club's usual penalty taker Jack Evans had missed recent attempts, while Gill was reluctant to take it.

[14] His teammate Fred Keenor later described the attempt, noting "There is no doubt that the excitement and the knowledge that so much depended on the shot unnerved Len a little.

Under ordinary circumstances it would have been a gift goal, but Len Davies muffed the kick and the ball rolled gently to the goalkeeper, who calmly gathered and made an easy clearance.

"[15] The game eventually ended goalless while their nearest rivals Huddersfield Town won 3–0 and secured the title courtesy of goal average.

The difference between the two sides, 0.024 of a goal remains the closest margin of victory ever recorded in the top tier of English football.

[3] He was again Cardiff's highest goalscorer the following year, netting 20 times despite suffering several injury problems that restricted him to 30 league appearances.

[18][19] The signing of Hughie Ferguson in 1925 led to Davies being moved to an inside forward role and his scoring record fell as a result.

The only goal of the game came as the opposition goalkeeper was unable to control a shot from Hughie Ferguson as Davies advanced on him.

[1] Davies made a goalscoring debut for Wales on 4 February 1922 in a 2–1 win over Scotland and was ever present for the side for a further three year, playing in every international fixture until 1925.

He was a prolific scorer during the tour, including scoring seven times in a single game during a match against a Lower Mainland XI.