Here in the PAM Fighter Command has slightly better survivability in it's aircraft, armor plate is factory fitted as are self sealing fuel tanks. That saves pilots lives and lessens the injuries of more. There is a proper air sea rescue system that not only saves RAF aircrew but will capture some Luftwaffe aircrew who were otherwise rescued by their own people. Aircrew training is better, there are four fighter OTU instead of the two in OTL and the finger four formation is becoming standard. All RAF fighters have at least two 20mm cannons so that when they hit they hit harder. finally there is the POC, a blooded, organised, coherent fighter unit who having fought in France, are revelling in the performance and fire power of their new fighters but are currently in Scotland training and getting impatient. All these small changes allied to better radar cover add up to cumulative effect. How big that effect is now really resolves down to the human factor, chance and the gods.