Yes, United Kingdoms Burnt Heather slate can be used in a bathroom. Slate is a natural stone that is known for its durability and resistance to water, which makes it suitable for wet areas such as bathrooms. However, it is important to ensure that the slate is properly sealed to prevent staining or damage from moisture. Additionally, it is advised to consult with a professional or supplier to ensure that the specific type and finish of the burnt heather slate is suitable for bathroom use.