Misc: What is the birthstone for september?

Questions

which bbc1 police drama starred warren clarke and colin buchanan?

in which bbc1 drama series did lenny henry star as headmaster ian george?

which crimewatch presenter fronted bbc1's series 'so you think you're a good driver'?

what was the title of the specials 1981 number 1 hit?

who wrote the novel on which the film 'maybe baby' is based?