Currently £15 on M&S's website (https://www.marksandspencer.com/senior-boys-skinny-leg-slim-fit-trousers/p/clp60450638?color=BLACK).
Bought for choice but stupidly forgot to return in time. Postage charged at cost only, sent within one business day.
Retailer's description as follows:
"Step out looking sharp in these smart boys' school trousers. Narrower through the waist and with a skinny leg to create a modern look .Added stretch for flexibility and comfort. Crease-resistant fabric help creases fall out easily and our Stain and Weatherproof finish repels water and stains. They also come with and adjustable waist and grow proof hems, just unpick and press for an extra 3cm. Made with recycled polyester and responsibly sourced viscose.
Skinny Leg Shape – a tapered leg for our most fashionable cut. Slim Fit- a 4cm narrower cut through the waist and/or body."