Just found a reference to this team in 1952, which was one of a number put up in successive years by this particular UAS:
Two Chipmunk T.10s of Belfast (Queens) UAS, Sydenham, Flt Lt R R Austin and Fg Off R C Jones.
The UAS Chipmunk teams have largely gone unrecorded, probably because they did not have the appeal of the bigger - and more noisy - display teams?