If I understand the question correctly I would comment as follows:
Driver Exceeds 9 hours driving on Friday and Saturday - hence 2 driving increases for that Fixed Week. Next shift starts for example at 2130 on Sunday with 2 1/2 hours driving on Sunday followed by a further 7 hours after midnight on the Sunday. Or something similar to that.
As I understand the Regs Daily Driving time is accumulated between the end of one Daily /Weekly Rest period and the start of the next daily / Weekly Rest period. Therefore, the Daily Driving period commenced on the Sunday prior to the FIXED WEEK DIVIDE and so that 9 hours 30 minutes driving is actually allocated to the Sunday which would make it the 3 rd increase.