You'll be surprised at just how good the OEM brake pads actually are so don't let that put you off braking harder and later as you progress through your sessions.
We are still using stock pads and switched back to stock master in racing mate. The only weak point will be the fluid.
I've put the donnington video on as a link, the brakes work OK there ;-);-)
Brake correctly, small application to transfer weight, then a nice big hand full, release 70% and tip in, trailing a little to hold the line required. Apex and power on hard