When I was taught to fly in 1962 by Charles Cockburn/Digby Docherty/Bernie Warman/Dick Gliddon to name a few of the Southend Flying School's instructors (also in G-AJUE/G-AGTX/G-AIZY) Stalls were Ex9, Spinning Ex10, Circuits Ex11/12 and first solo Ex13, the rest are also 1 number low, I don't know where the extra exercise was slotted in but I have a copy of the BLAC Instructors manual dated 1965 which has the exercises listed as they are now.