Spending Day with BoB Spitfire Pilot - Questions Please

So he was one of the first to fly spitties?

My question would be:

- Was it attempted to hold formation when attacking an enemy formation or was it everybody by his own when attack order was given?

- Were standard defensive manoeuvres trained and executed when attacked?

- could you decide on what ammo was put into your belts?

- which were your prefered ammo types?

- What convergence did you prefer and could you select horizontal and vertical convergence separately?

- How long is the burst one needed to down/put out of fight a 109, a He111 a Bf110 (approximately)?