RAF Northolt Ops
Johnathan,
Probably you will have read my RAF Antarctic thing here and note the RAF Hendon connection. In 1949, Northolt was satellite to Hendon. It doesn't help you directly but I can tell you that as a member of RAF 31 Squadron Association that Air Commodore Jerry Witts DSO RAF(Retired) wrote up RAF Northolt whilst he was CO. Jerry was 31's Boss.
This means that you should contact the Press people at Northolt to see what is printed and what else is archived. My copy went to 31's archives!