Ofcom replied.
Ofcom can confirm that the total number of individuals holding one or more current UK Amateur Radio Licenses is 9971.
Daryl Spence M0TTY asked Ofcom via a FOI request "could you please give me the current numbers of licensed Amateur Radio operators for each callsign type please."
Call Sign Count of Live Prefix Call Signs
20 = 8612
21 = 1596
G0 = 8615
G1 = 4910
G2 = 164
G3= 4631
G4 = 9157
G5 = 58
G6 = 4901
G7 = 5829
G8 4837
M0 = 8363
M1 = 2275
M3 = 9961
M5 = 297
M6 = 13777
Grand Total 87983 active licences.