Anna Scher, who has died aged 78, gave acting classes to countless young people at her north London theatre school. Gary Kemp, Jake Wood, Winsome Pinnock, Trevor Laird and Ricardo P Lloyd recall a remarkable teacher I first went to Anna's school in Islington in 1969. I had some money from my paper round and used that to get in " I didn't even tell my parents. A friend of mine had said it was good fun. The work we did…