Pretty much exactly my plans BPF, with the addition of from some heavy emphasis on RT (his request, as he's not flown in the UK significantly) and finish off with a longish trip somewhere to give a big chunk of real-world nav/RT practice en-route (again, at his request).
But it's not looking as worrying as I imagined. After all, if there were no questions about somebody's flying ability - why are they going to an instructor.
The general picture however remains interesting - this issue of somebody, if not my current student, trying to "help themselves" by flying with multiple instructors and doing themselves far more harm than good. It's clearly not a unique question.
G