I've decided to earn myself some extra pennies by tutoring (inspired by "Pay off your mortgage in 2 years"). But I need to write the ad. What about this:
Tutor available
I am an excellent teacher, Oxford degree, and experience in teaching in inner and outer London as a class teacher, trainer and head of maths. I have vacancies for a small number of evening tutees, for a series of sessions or one offs. For £25 an hour I can help you catch up, understand difficult concepts, design and follow a revision schedule, learn how to maximise your lessons and homework.
Maths (up to GCSE), History (all levels), Study Skills, Thinking Skills
Call blah blah blah