The term 'pastoral expanses' refers to large areas of land that are used for grazing animals, such as sheep and cattle. The term is derived from the Latin word 'PASTOR', which means shepherd. The term is often used to describe rural landscapes, such as those found in the countryside. The four-letter acronym LEAS stands for 'Livestock Enterprise Area Scheme', which is a scheme set up by the UK government to help farmers manage their land more effectively. This scheme provides grants to farmers to help them improve their land and increase their productivity.