The PG Tips Monkey Heat Changing Mug is a rare novelty item released for Comic Relief in 2013. Made by the renowned British brand PG Tips, this unique mug features a design that changes when hot water is added, revealing a playful monkey image. Perfect for collectors of advertising memorabilia or fans of tea brands, this original piece from the United Kingdom is a must-have for those looking to add a touch of fun to their daily cup of tea.