Are Amnesia players adults or teens?

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And is it expressly illegal to sell 16+/18+ games to minors?

Yes, sometimes the council will pay underage kids to go into shops to try and buy them. This is mainly for 18+ rather than 16+. Happens a lot with all items such as Cigs, Alcohol and films as well as games.

If they manage to purchase the item it shows they hadn't been ID'd and whatnot. Shops can get fined thousands sometimes, a friend of mine works in a small shop business and a guy sold alcohol to an under 18 and they got fined thousands, and the shop lost their licence to sell alcohol.

Well, alcohol and tobacco I can understand. Still, I know for a fact, at least I think I do, that it is only illegal to sell AO games to minors in the States (most states, anyway). Same as with the movie rating systems, they are just guidelines that many establishments follow to the letter without needing to do so.

Since there is no real evidence that video games or films do any actual harm, and you can make an excellent case for censorship of any kind doing more harm than good, I am completely against rating systems like that.

EDIT: It seems that you need permission to buy M rated games, probably the same with R rated movies as well.