Best vouchers for 20-somethings?

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I’d like to get a voucher for DS’s nursery teachers but I’m a bit out of touch. They are late 20s/early 30s, in Central London. All young women and have a fun/on-trend sense of style. What is a good voucher? A specific shop or something like Amazon? I will probably give £30 or so per person.

I’m getting the early 20-something i need to buy for for Christmas a Cult Beauty voucher.

Thanks, any other ideas?

Asos is a good one or if not then one of those high street shop vouchers that you can use in a variety of shops.

Asos, zara, Harvey Nichols (for makeup etc).