This case is undoubtedly going to be a battle of the expert opinion.
Bear in mind that the "10 Downing St" reply is based on information received from the CAA - or "the defendant". Now read Ian's pre-hearing report above.
It becomes immediately apparent that the CAA defence will rely entirely upon "expert" medical opinion.
They have a small army of Profs, Specialists, Consultants who all accept part-time consultancies in exchange for having their bank accounts massaged with CAA (your) money. They use consultants from some of the leading hospitals.
Most of these same people would not agree that the age of a 60 or 65 yrs old pilot is in any way directly relevant to their medical condition.
One of the current aviation medical problem areas is actually with young(er) pilots working on long haul - and they are TOO fit to fly. Fit distance runners = enlarged heart + long haul = early death.
Ian - you will need your experts lined up. Suggest you start by approaching some of the ones on the CAA list. Friendly fire can win these cases.