A、Ban pupils from bringing "inappropriate" designer handbags to lessons. B、Ban pupils from bringing "inappropriate" designer A4

(19) A school has been forced to "ban" pupils from bringing "inappropriate" designer handbags to lessons. (20) Teachers at All Saints’ Academy in Cheltenham, Gloucestershire, claim the luxury items are not suitable for dairying A4 files, textbooks and PE kits. Some of the 900 students who arrived for the new term on January 5 with new bags from designers including Ted Baker, which can cost up to ￡289,were told to bring a rucksack the next day.
     (21) Parents at the church school, which opened in 2011, said the clampdown was "pathetic" and argued that many designer bags are perfectly functional. One mother, Martine Allen, claimed her teenage daughter was given a warning over her new ￡39 pink Ted Baker shopping bag. The 32-year-old said:" I fully understand and totally agree with the handbag situation going on. But my daughter’s bag is 36cm in height and width and a 15cm depth. It can carry all her books, PE kit, lunch, in it at once." "In my sense it is fully reasonable for her school equipment. She now has to take a Jack Wills rucksack which doesn’t fit half of what she needs in it and it is a named bag."
19. What has the school mentioned in the passage been forced to do?
20. What’s the attitude of teachers at All Saints’ Academy towards the ban?
21. When did the church school open?