David Pipes says: These are all packets of 10 cigarettes.
Presumably, if it was pay day or you were a heavy smoker then
you could buy a packet of 20 cigarettes which contained two
cards. I can confirm that this “Sports Series” of cards only
contained a total of 9 speedway riders, the remaining sports
personalities being golfers, boxers, jockeys, tennis players,
rugby players, cricketers and ice hockey players. Footballers
were the subject of separate card series.