Occasionally someone will come up to me when I' busking and ask me if I give violin lessons. This is the point where I ask them a few questions. Usually through the questioning stage they decide they/their child/aquaintance would not be served well by regular lessons from me. As a result, I have only given one paid lesson on the violin in my life. Some bloke came up to me when I was busking in Chelsea and gave me £10 to give him a cheeky lesson in the park. An ODP who'd shown me a few things in Ealing Hospital happened to be passing and the three of us retired to a bench beneath a shaded tree where my lesson consisted of me saying 'Just look on youtube mate, then listen and stuff, but hold it like this.'.
I give out lots of free lessons. I particularly enjoy teaching 3-6 year olds because they hold a violin like a guitar. For me the only important lesson at that age is to respect the instrument and not drop it, which all of my pupils have so far passed.
Today a young man who is playing guitar regularly on a Sunday in his church came up to me and asked me for lessons. This is a very good start if you want to play music. The weekly discipline of a public performance combined with the general focus of a congregation is good for a musician. I told him it's £20 a lesson and he told me he doesn't have a fiddle, so I told him it's £100 a fiddle, it'll be made of crap wood but it'll do you through a few things. Considering I'll have to spent £45 on strings for it and part with a decent tailpiece..... Then I gave him a free lesson on the street and he struck a decent F sharp on the E string double stopped with the open A under instruction. Asked to do it again, he would succeed. He really wants to learn it.
So hopefully I may have found a pupil. On an ad hoc basis though. He's not gong to pass any grades with me as a teacher. I don't like grades. In music there are only performances and editing.