Birkett was an important figure in the formation of the Rugby Football Union as well. Clapham Rovers were one of the twenty-one London and suburban football clubs that followed Rugby School rules that assembled at the Pall Mall Restaurant in Regent Street and formed the Rugby Football Union on 26 January 1871 and Birkett was not only present but also became one of the thirteen original committee members. Birkett was selected for the first international rugby match for England vs Scotland in 1871. In this match he scored England's first ever try, although at the time a try did not gain points, but rather was the means by which a team was granted the opportunity of converting the try into a point scoring goal. His brother Louis and his son John later also played for England. Of his rugby ability a near contemporary account states that he "was very useful both forward and behind the scrummage, and had plenty of pace."
Football career
When Reg Birkett was playing association football and rugby football, the two codes had not long been separated and the term 'football' could still apply to either. Whilst at school, he played both codes and was a member of Lancing's senior soccer team in 1866–67. He then joined Lancing Old Boys, and then on to Clapham Rovers FC, a club that played both codes of football and had distinguished itself in both. Birkett also represented Surrey FC. In 1879, Birkett had a season in which he both reached the FA Cup final and was selected to play for England. In the 1879 FA Cup Final, played at Kennington Oval on 29 March 1879, Clapham Rovers were runners-up to Old Etonians F.C.. Birkett was the goalkeeper and was beaten at close range by a shot from Charles Clerke. However, despite letting in the only goal of the match, Birkett's prowess as a keeper was well respected and he went on to be selected for the England vs Scotland friendly international a week later, on the same ground. Despite conceding four goals, he was on the winning side, England prevailing 5–4. The following year, Clapham Rovers once again made it to the FA Cup final. The opposition this time was Oxford University A.F.C.. Clopton Lloyd-Jones scored for Clapham and combined with Birkett's clean sheet, Clapham prevailed 1–0.
Reginald married Lizette Crunden in 1881 in Cuckfield, West Sussex. They had at least two sons, Gerald and John . A skin and fur broker by profession, he died at his Wimbledon home following an accident; whilst suffering from diphtheria, he leapt from a window while being helped into his bed and fell 20 feet to his death - at the inquest, a verdict of suicide whilst delirious was returned.
