Increase the line pressure way above the normal values, get the oil too hot to the point it gets degraded, too much uncontrolled torque run through etc.
I drove the car from RT-Performance to AbbeyMotorSport with absolutely no problem at all, about 70 miles, no clutch sleeping or any other problems with the gearbox. To cut the story short, I've left it there while I went abroad and collected with the gearbox shattered, breaking down on M25.
Long story, I will post more details after I speak with Mark again next week. He hasn't replied yet to my last email sent on 10th of September.
Are Abbey contributing towards the repairs to the damage done as it was while they had the car?