I have recently got my grandfathers war records for the RAF. He was a temporary Sargent ground crew, I have been trying to read what has been sent to me. At one stage he is working with 615 squadron in January 1943 and then seems to get sent to HQ (u) 224 group. Does anyone know if this would be the main airfield for the 224 group? would this be Chittagong?

Many thanks for your time and help