[4] In 1936, at the age of 33, he opened the Park Street Orthopaedic Clinic, where he pioneered treatment in sports' injuries, stimulated by his experiences as a rugby player.
[5] With the outbreak of the Second World War imminent, Tucker returned to the RAMC TA General List, and was promoted to captain on 12 April 1939.
He was captured by German forces early in the conflict, when he chose to remain behind to treat injured soldiers, during the Dunkirk evacuation.
[2] After his repatriation from Germany, he was appointed Member of the Order of the British Empire on 3 February 1944, "in recognition of gallant and distinguished services during and prior to captivity.
"[2][7] After the war, while retaining his TA commission, he returned to work at his London Clinic, and through focusing on injuries to sportsmen and women, it became a very successful business.
Tucker elected to keep his clinic open seven days a week, therefore becoming a first port of call for sportspeople injured during weekend sporting events, this was very popular with jockeys who required to return to racing as soon as possible for economic reasons.
Tucker's TA career continued in parallel, he was promoted major on 15 August 1947, and concurrently granted the acting rank of lieutenant-colonel.
[5] On 24 July 1960 he was appointed Honorary Colonel of 17 (London) General Hospital, RAMC, TA,[15] holding the position until 1 December 1963.