Crikey, page 173
Bell design manouver limits 50 AOB and 15/30 down/up pitch were the maximum values considered for Certification
MOD applied limits 90 AOB and 90 pitch.
Those saying no harm can be done to a helicopter by "aerobatics" (and what constitutes an aerobatic manoeuvre) might like to read up on this one and think again.
I seem to remember in my past life the Lynx being demo'ed rolling, the first for its time, however I was also informed at the time the main rotor gearbox on it had to be replaced within 10 hours due to the stresses on it, whether correct i do not know, but at the time I was told that.