I have to wonder why mumsnet is allowing adverts for a company called Nancy London. They have a 1 star rating on Trustpilot, with the consensus being this is a scam company, where the goods are very poor quality, shipped directly from China and are nothing like the photos.
People also complain about returns being impossible. Some reviews are very recent and 98% of reviews give 1 star. Stop showing this ad mumsnet!