Thanks for the info, Salty. However, according to the Express & Star dated 20th April: "...at Coventry tomorrow, Howard Cole makes his last appearance at reserve." It then goes on to say, "On Monday, when Cradley are at home to Swindon, Cole moves into the team proper with Pete Jarman slipping to reserve." So if Swindon at home wasn't one of his meetings at reserve, which was the sixth match he rode at reserve?
What we need is someone with the copies of the Speedway Star for March and April 1973 which would give all results, plus his match average, which, according to that same article, was high enough to top the Cradley averages.