Maths tutor - A'level and beyond

[T.i.p.s.y]

I was wondering if anyone knows of a tutor who teaches the above. I don't want a tutor to get my son through exams (though we may opt for this at a later date) but someone who will be able to stretch and inspire him and aybe teach him subjects off the curriculum.

Anyone know of any inspiring maths tutors out there that don't stick rigidly to the curriculum?

Thanks!