With respect I think - were I an MO - I'd be reticent about grounding somebody for a condition that had been repeatedly tested over many years, with the condition being described as (essentially) stable
Given the reported restriction of neck movement, do you think it was wise to allow someone suffring this condition to perform aerobatics with an inexperienced passenger?
On the subject of look-outs, the Tutors I have seen of late usually do a wide orbit before commencing aeros. I'd be interested to know if this was standard practice prior to accident.
My belief is that NOBODY ever realised that Mike could be incapacitated (or killed) by a relatively minor impact - so the potential for tragedy was not appreciated until after the event....hindsight is, as ever, 20:20 vision.
Have the rules regarding AS have now been tighened as a consequence?
a less congested place by offsetting laterally from the choke point
Given the attraction of Didcot power station to the gliding community, I would suggest offsetting some distance west along the Vale of the White Horse.