British classic car glossary
By British Classic Cars · Last reviewed May 25, 2026
Owning an old car comes with its own vocabulary. Some of it is official terminology you’ll encounter the first time you fill in a form at the DVLA (V5C, historic vehicle status, the forty-year rule). Some of it is industry shorthand that gets used in classified ads and at auctions (agreed value, concours condition). Some of it is trade-body branding that ends up insurance-relevant whether the owner intended it to or not (CaSSOA Gold). Most articles on this site lean on these terms without redefining them in body copy, on the assumption that the linked glossary entry does the work better.
The entries currently live in four loose groupings: the DVLA paperwork (the forty-year rule, historic vehicle status, the V5C itself, Q-plates and age-related plates), insurance structure (agreed-value cover), storage standards (CaSSOA), and condition grading (concours condition). Each entry is short enough to read in three or four minutes and carries its own FAQ and cross-links. The set grows as the rest of the site grows.
Related
For the broader scope question of which cars count as British classics in the first place, see which cars count as British classics?. For the temporal question of when a car actually becomes a classic, see when does a car become a classic?.
Explore this topic
- The 40-year rule, explained: The DVLA's rolling rule that reclassifies cars as historic vehicles on their fortieth birthday, with what it actually unlocks (and what it doesn't).
- Historic vehicle status (DVLA), explained: The official DVLA tax class that qualifying classic cars sit in, how to apply for it, and what it changes about owning the car.
- The V5C, explained: What the V5C registration certificate is, what each section records, and the common situations where the V5C is the document that actually matters for a classic car.
- Q-plates, explained: What a Q-prefix registration is, the circumstances where the DVLA issues one, why owners often want to avoid it, and how (sometimes) to get rid of one.
- Age-related plates, explained: What an age-related registration is, when the DVLA issues one, the evidence you need to apply for one, and the situations where classic-car owners typically end up requesting one.
- CaSSOA, explained: What CaSSOA is, what the Gold / Silver / Bronze ratings mean in practice, and why insurers and owners both care about CaSSOA accreditation when choosing a storage facility.
- Agreed value insurance, explained: The classic-car insurance structure where you and the insurer agree the car's value upfront, so any total-loss claim pays out at that figure rather than a depreciated market value.
- Concours condition, explained: What "concours condition" actually means as a classic-car grading term, the scales different valuation systems use, and how concours-grade examples sit at the top end of values.