Gift ideas for 12 year old girl and 10 year old boy please

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Visiting an old friend soon and would like to take 'thank you for having us' gifts for her kids. Daughter has just turned 12 and son will be 10 in February, so they are in school years 5 and 7.

Can't afford to spend much more than £10 each.

No idea what to buy - please help! Thank you in advance. :-)

If you have no idea of interests then a book token or voucher for Waterstones is always well received.
Sweets or nice chocolate.
My kids are the same age and love online games, so a voucher for Roblox or similar would also be very welcome. But that’s quite specific so I wouldn’t do that if unsure.

Thanks @Cryingbutstilltrying! Have an 11 year old DD myself and she would love Robux too, it just feels like that or a voucher is more of a 'send by post/email' present than a 'hello lovely to see you' present. If that makes any sense?

Books/book voucher
Lovely notebook from Paperchase
Plant your own ... kit for their bedroom. I got a miniature bonsai kit for DD's stocking. Can't remember where from, but it went down a storm. Or a Venus fly trap?

12yo girl:
Exploding Kittens is currently £10 on Amazon
Mug cake kit
Shower steamers and face packs
Nail varnish
Mug and hot chocolate stirrers
‘Sussed’ card game

My 12yo and 10yo DDs are both into fidget toys. Also always happy to receive a bag of sweets/chocolate.

My GCs like craft things, Lego, the older one likes toiletries.

Minecraft calendar