Was the aircraft operated under the Warbirds Association?
I think you will find the answer to all the above is "no"
601,
The aircraft was on a Limited Cat. certificate, and, therefore, administered by AWAL.
The aircraft could not do "joy rides", (ie: a charter) but could do "Adventure Flights", for which no AOC is required, but must be operated to the standards of the AWAL manual, which includes a suitably experienced CPL as the pilot.
Tootle pip!!