Gift ideas for young teens/pre teens?

[Lochroy]

We are going to stay with friends over the May bank holiday weekend and I’d like to take gifts for their children but I don’t have a clue what to get. £10-£15 each, 12yo girl, 13 yo boy, 14yo girl. Any suggestions please? I don’t know anything about likes/dislikes.

At that age, I’d say hard cash and a chocolate bar!

Ooh that's a really hard age, especially if you're not sure what they're into. What about a card game they can play together and a bunch of snacks (Pringles, pretzels, chocolate and Haribo then you cover all bases of whether they like chocolate not or prefer savoury snacks)?
https://www.menkind.co.uk/taco-kitten-pizza-card-game

My newly turned 13 year old loved this website for choosing what he wanted for Christmas. He picked random stuff that I would never have got him. A good range of prices too.
https://www.menkind.co.uk/gifts-for-kids/gifts-for-teens?sort=calculated_price%3Aasc

Also agree with PP, cash or maybe a voucher for Starbucks or similar if you know there's one nearby.