Unfortunately giving young teens alcohol, letting bfs sleep over in same bed, letting them smoke weed in garden. All acceptable choices for fuckwit parent of 14/15 yo in my neck of woods. OH, and letting them stay at home and not bother with school shock. Wonder why 37% last year achieved 5+ gcses and we have one of highest teen pregnancy rates. (Crying quietly in corner.)
Hmmm... About to get flamed again, maybe.
Agree with you re smoking weed, tbh, and school's important too, but the alcohol and sleeping over are totally different issues, IMHO.
Better, I think, to let young teens learn the effect alcohol has on them while they're in a private house with parents (even other people's parents) around to save them when they - inevitably - overdo it. Better than drinking vodka on a Park bench, I mean. It's legal, too. (I think the park bench option isn't.)
And in my experience, teens who get used to it at home are less likely to overdo it later. There's actually some research evidence to support this - shame I can't remember where I read it.
Also, in Germany (as I understand it - Wikipedia article), 14-year-olds can drink alcohol in a pub, provided they have a parent/guardian with them. (Not spirits, though.) And it's for precisely this reason.
And the sleeping over? At the school I last worked at, I'm pretty sure this happened. It's amazing what they talk about when they forget there's a teacher in the room. But the teenage pregnancy rate was zero (unless they were very good at covering it up) and the GCSE 5+ A to C pass rate was 100%.
So I'm reasonably convinced there isn't a causal link here.
Incidentally, in Germany (again!) the age of consent is 14 yet their teen live birth rate is about half of ours. I can't find figures for their teen pregnancy rate but I can see no reason why German teenagers should be more likely to have abortions so I guess that's lower too.
But to return to the OPs original question - it perhaps isn't usual in the UK but it isn't wrong, and if the research evidence is to be believed, might even be better than trying to keep them away from it. That will just make them want it even more.