Are you sure? My squadron boss seemed to believe that you can log 'blocks time', as the Tutor's are G registered Part-21 aircraft, it would follow that you can adopt the civilian interpretation of 'flight time' as opposed to the military one, as after all, they are civilian registered aircraft.
There is a world of difference between logging 'block time', contemporaneously, and retrospectively adding a random figure to your 'airborne hours' to create 'block time'.