Yes, Ciate London UK is a legitimate company. It is a well-known cosmetics brand that has been in operation for over 10 years. The company is known for its innovative and approachable beauty products. It is PETA certified, cruelty-free, and vegan. The company has a good reputation, with many positive customer reviews. However, as with any online purchase, it's always a good idea to do your own research and make sure you're comfortable before making a purchase.