More funny and heartwarming adventures for the North Yorkshire village school and its eccentric occupants.       1984 -- and it's an important time for the children of Ragley-on-the Forest school. Their school choir is to sing a carol in a church in York, and is actually going to be on television! Helping to keep his excited children, not to mention their parents, under control during these momentous events taxes jack and his staff to the limit. And at the same time, Jack has his own problems to deal with. This is the eighth instalment in his much loved Teacher series.