Thanks for the reply, Mootyman,
To be completely honest, I have absolutely no idea.
It is a group owned aircraft and I doubt that any one person is going to put their hands up to having punched her into the ground on landing or having flown it well outside the envelope. I'll find out tomorrow when all are 'around the table'.
Could there be other less obvious causes that I am missing?
Regardless of the cause, any idea on prognosis?