Widely acknowledged as the most comprehensive register available, the book lists all current United Kingdom, Ireland, Isle of Man, Guernsey and Jersey allocations, as well as overseas-registered aircraft based in these countries, aircraft that have both joined and left those registers since publication of the 2020 edition, and non-current aircraft still extant, under restoration, in storage or used for ground training purposes. Each entry contains the registration, accurate type, construction number, original registration date, all previous identities, the registered owner(s) and the probable base. Extra notes include dates for Certificate of Airworthiness and Permit to Fly expiration, the dates of declarations of non-flight and evidence of insurance, plus notes on the original aircraft constructor, any markings and names carried and the airframe’s status if it is not active. Each section has an index of types. There is also a separate section containing the British Gliding Association register with handy cross-references to competition codes carried by gliders. The full register of nearly 600 aircraft that come under the aegis of Aviation Heritage UK (formerly the British Aircraft Preservation Council) is included. Further sections include civil-registered aircraft held by museums and collections in the UK and abroad, a decode table for aircraft flying with military serials, and lists of overseas registration and B-Conditions prefixes. A handy tab system along the side of the page enables easy navigation.