refers to household extensions greater than four metres but less than eight metres for detached dwelling houses, or three metres but less than six metres for other dwelling houses, as covered by the neighbour notification scheme as set out in paragraph A.4 of the Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 1)

refers to a development consisting of a change of use of a building and any land within its curtilage from a use falling within Class B1(a) (offices) of the Schedule to the Use Classes Order, to a use falling within Class C3 (dwellinghouses) of that Schedule. (Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 3, Class O)

'Sui generis' is the term used for uses that do not fall into any planning use class. According to https://www.planningportal.co.uk/info/200130/common_projects/9/change_of_use, such uses include: betting offices/shops, pay day loan shops, theatres, larger houses in multiple occupation, hostels providing no significant element of care, scrap yards, petrol filling stations and shops selling and/or displaying motor vehicles, retail warehouse clubs, nightclubs, launderettes, taxi businesses, amusement centres and casinos. (Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 3, Classes M and N)

refers to a development consisting of— (a) a change of use of a building and any land within its curtilage from a use as an agricultural building to a use falling within Class C3 (dwellinghouses) of the Schedule to the Use Classes Order; and (b) building operations reasonably necessary to convert the building referred to i (Town and Country Planning (Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 3, Class Q)

refers to change of use to state-funded school or registered nursery from various and provision of temporary school buildings on vacant commercial land (Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 3, Class S; Class T and Part 4, Class CA of Schedule 2).

refers to a development consisting of a change of use of a building and any land within its curtilage from a use falling within Class B8 (storage or distribution centre) of the Schedule to the Use Classes Order to a use falling within Class C3 (dwellinghouses) of that Schedule. (Town and Country Planning (Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 3, Class P)

refers to all other types of development for which decisions on applications for prior approval had been made.