RAF web site history of 22 Sqn says it was 7 Wing HQ, not 7 Sqn...
Badge: On a Torteaux, a Maltese Cross throughout, overall a 'pi' fimbriated - approved by King Edward VIII in May 1936. The Greek sign 'pi' denotes the Squadron's service in France with the 7th Wing, the pilots often taking off over the Wing's HQ - hence the 22 over 7, or 'pi'.