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'. When the badge was approved, the Squadron was based in Malta, which accounts for the inclusion of the Cross.
https://www.raf.mod.uk/our-organisat...s/22-squadron/