These M&S knee high boots under £50 are set to be a sell out for Autumn

These gorgeous Marks & Spencer knee high boots are this season's must-have.

When it comes to finding everything from the best bras to the best winter coats, M&S never lets us down. So when Marks & Spencer launched their new autumn collection with the help of Holly Willoughby, it's fair to say that we were more than a little bit excited.And it certainly didn't disappoint. With gorgeous jackets, cosy knits and pretty transitional dresses, this year's M&S autumn collection might just be their best yet. (We'll thank Holly for that.)

And while we love the whole collection, there's one thing in particular that's caught our eye: a pair of bang-on-trend knee high boots. Costing just £49.50, something tells us that these are going to be a sell out this autumn.

Shop them below...

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Block Heel Square Toe Knee High Boots – £49.50, Marks & Spencer

Available in both black and berry colours, the boots boast a mid weight block heel and an elegant square toe. Their stretch zip fastening ensures a comfortable fit at the calf, while their Insolia technology works to redistribute weight away from the balls of your feet – alleviating pressure and providing better stability. (So no emergency swap into flats halfway through the night here.) Available in sizes 3 to 8 including half-sizes, we'd advise snapping these ones up while you can.

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Whether they're paired with a midi dress for a boho-chic look, or they're dressing up a pair of the best jeans, the sleek boots will add polish to any autumn outfit.

So will you be treating yourself for the change of seasons?

If you're not so keen on this season's knee high trend, the new M&S collection has some great ankle boots, too.

We especially love these leather hiker ankle boots – not least because they lookjustlike a pair worn by the Duchess of Cambridge on a recent visit.

The Duchess Catherine dupe boots are already selling out on the M&S website, so you'll need to be quick to secure your size! Pair them with a chunky scarf and a floral midi dress for optimum autumn style.

So whether you're in the knee high camp or you're a committed ankle boot fan, the new Marks & Spencer collection has some gorgeous options.

Will you be treating yourself to a new pair of boots this autumn?