No, Olay is not a UK brand.
Olay was originally founded in 1952 in South Africa by Graham Wulff. While the brand has a global presence and is sold in the UK, it is currently owned by the American multinational corporation, Procter & Gamble (P&G). Therefore, it is considered an American brand under the ownership of P&G. The original name, "Oil of Olay," was inspired by the ingredient lanolin. Today, Olay boasts over $2 billion in annual sales globally.