From Roader's Digest: The SABRE Wiki
Two well known examples of this are the A14, originally Royston - Alconbury, now Catthorpe - Felixstowe (although part of the original A14 is now a spur of this incarnation), and the A42, originally Reading - Birmingham, and now Appleby Magna - Kegworth.
Examples of early recycled numbers (all before 1932) include:
- A5070 initially in Ormskirk, Lancashire then Hinkley, Leicestershire
- A239 initially allocated to the Kingston Bypass, Surrey then in Mitcham, Surrey
- A295 initially allocated to the Bexleyheath Bypass in Kent, then in Hailsham, Sussex
- B472 initially allocated to the Slough - Chalfont St Peter road, Bucks, then the Beaconsfield - Amersham road, Bucks
- A687 initially allocated to the Scotch Corner to Darlington road, Yorkshire, then the Cantsfield, Lancs to Ingleton, Yorks road