|Ted Riding's 1939 British Army enlistment form|
And he did. The record was opened this month.
|2–6 Derby Rd, Bournemouth in the 1939 Register|
He was listed in the register as single and working as a valet (previously a hotel porter) at the same Bournemouth address (4 Derby Rd) he gave in his enlistment papers, which appears to have been a boarding house where various hotel staff and other boarders lived. A guest house at that address was later described as follows: "Ideally situated corner position convenient for railway station, sea and shops, overlooking putting greens".
He was not a storekeeper as stated in his enlistment papers – it is possible he said that to increase his chances of being assigned to the ordnance corps. A valet in a British context appears to be a manservant who handles laundry and shines shoes for hotel guests. He was also only 17 years old, not 21.
(For the curious: the abbreviation UDD stands for unpaid domestic duties, the most common occupation for women in the 1939 Register.)