Just googled it and apparently it was so common they changed the observations to random around 2 years after I left. It'll not make too much of a difference. Google Ofted cheat uk if you want more examples.
http://metro.co.uk/2012/01/10/clampdown-on-cheat-schools-with-no-notice-ofsted-checks-281119/
Yep especially weed, schools shit on it a lot here and it encouraged more people to do it especially at school. Tell people the dangers of every drug but don't exaggerate shit to try and scare me. Present a balanced argument to let people make decisions and let them debate it with their true opinions not what people want to hear. Schools are there to teach you less academically and most spiritually you start to get an idea who you are as a teenager and that should be encouraged. Knowing your alphabet is great, knowing it's OK to present your thoughts on why A should be after B is so much better and will get you further.