What are some shops in the UK that sell cheap, but good skinny jeans?

I live in the UK, and all of the skinny jeans I have keep stretching when they're on me so that they don't look like skinny jeans, Basically, when i bend my leg or something like that, it stretches to much and goes baggy. Do you know any places in the UK that sell cheap but good skinny jean? It can be from twenty pounds under.

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