I've been to their St ann store, took the wrong size by mistake, went the next day to exchange one of the 3 trousers to the right size, staff didn't give me a new receipt for the new trouser so I assumed that when you change size they don't give you a new receipt. 2 days later I noticed the trousers' fabric are rubbish and colour is leaving marks on my skin and other clothes as well so I decided to return the trousers, staff and manager refused to return the one that didn't have a receipt although it was staff mistake that she didn't give me a receipt, instead of the manager apologising for her unprofessional attitude and investigates further he spoke rudely and threw the trouser on the floor in front of all customers and said I'm the manager and I'm not returning it that's my decision if you don't like my decision call customer service. I did and they said they opened an internal investigation but I don't believe them plus eventually they send me a gift card not my cache, I had to take responsibility for their staff mistakes, M&S are desperate for any client and couldn't handle the loss of £30, they tried everything to keep it in store, rubbish store, rubbish management, rubbish products, hope they close soon, don't go there and save your money