According to the posted link the CAA Airworthiness Approval cleared the aircraft to:
6.2.1 Aerobatic manoeuvres, intentional spinning and stalling are prohibited.
6.2.2 Load factor limitations: (see Marshall Aerospace manual for full listing)
Weight up to 160,000 lb, up to 0.89 IMN, no aileron +2.0g/0.0g
" " with aileron +1.8 g/0.0g
Manoeuvres under zero or negative g are prohibited.
I'm not qualified to comment on the authenticity or otherwise of the photographs.