A re these the most wanted jeans in Britain right now? They come in grey or white, cropped at the ankle with a curved leg, cost £49.50 and are available at Marks & Spencer — if you’re quick. They aren’t just any pair of jeans.

They are “M&S x Sienna Miller” barrel-leg jeans. The denim strides only hit shop floors on Thursday morning, as part of the It girl’s latest collection for the high street chain, but most stores are already almost entirely out of stock. So far thousands of pairs have been snapped up.

Only the nimblest customers have been fast enough to get theirs. Stock of the grey variation sold out within hours on Thursday — proof that blue skinny jeans are well and.