I teach both knitting and crochet to adults and children.
Classes are run on an ad-hoc basis from my house in Grove Park, Chiswick, London W4. I am currently teaching a group of 6-9 year old girls how to knit, a group of young mum's how to crochet (and it's quite like a creche!) and a few one to one knitting classes for people at various stages. The basic premise is that it is £36 per hour for up to 4 people. I am very flexible about times and can do certain times during the day, and some evenings.
If you are a beginner then I estimate between 4-6 hours of classes (perhaps less if it is one to one), ideally spread out with at least a week in between to allow you time to practice what you have learned. I have found that groups of friends works much better than pre-arranged classes, because the lessons are more fun and generally you learn better when you are having fun in a relaxed and friendly environment.
I am CRB checked.