Saving a Classic Car: Preserve, Repair or Restore

Before spending anything, get the car on a hoist and inspect the structure properly. On a monocoque car that means the sills, floor pans, chassis rails, jacking points and the metal around suspension and seat belt mounts; on a separate-chassis car, the frame itself. Press suspect areas firmly and tap them lightly: sound steel feels solid, while rotten metal flakes or gives. Look for filler, fresh underseal and plates laid over old metal, which can hide earlier bodges. If the car has been tested in Great Britain since 2005, its MOT history on GOV.UK lists past failures and advisories, a useful map of known corrosion.

The MOT inspection manual is a sensible standard for any structural repair. Testers pay particular attention to load-bearing metal within 30cm of the brake, steering, suspension and seat belt mountings, and corrosion there fails if it has made a hole or feels soft under finger and thumb. Repairs to load-bearing members must appear as strong as the original, with welding carried into sound metal and patch repairs generally seam welded continuously. Gas brazing, solder, adhesive, fibre reinforcement and body filler are not acceptable there. Cut rot back to clean steel and let new metal in properly.

The Charter of Turin, adopted by FIVA, the international historic vehicle federation, in 2012, defines each approach. Preservation protects a car's present condition. Conservation stabilises it without altering original material. Restoration replaces missing parts to show the car as it was at an earlier point, while repair simply makes it work again and may disregard originality. The charter also treats changes made during a car's working life as part of its history, so worn original paint or a period accessory need not be erased. Agree which approach you want before work starts, because it shapes every later decision and cost.

Records protect a car's identity. The Charter of Turin recommends that all work be planned and documented, so photograph each stage and file every invoice. DVLA says you must keep photographs of the VIN if a repair will stop it being identifiable, and a replaced chassis or bodyshell must be reported on form V627/1. For many British makes, the British Motor Museum's Heritage Certificates, copied from the factory ledgers, can show build date, colours and original equipment. If an old car now carries an age-related number, form V765, endorsed by an owners' club, may recover its original registration.

Some changes make a classic more usable without erasing its history. Electronic ignition kits such as the Aldon Ignitor and Lumenition Magnetronic fit under the distributor cap and end the routine adjustment that contact breaker points need. The Charter of Turin asks that later modifications be discreet and reversible, and that important original parts stay with the car. Legally, under GOV.UK's MOT exemption criteria, a new type of suspension or steering, a chassis or bodyshell of a different pattern, or a non-original engine can count as a substantial change, with some exceptions. Read the criteria before modifying.

A car that has stood for years needs recommissioning before use. Most brake fluid is glycol-based and absorbs moisture from the air, lowering its boiling point, so renew it with the same type and inspect the hoses. Read each tyre's four-digit date code, week then year, and judge old tyres by age as well as tread. Unless the car is known to suit E10, use E5 super unleaded. While on SORN, it may only be driven to or from a pre-booked MOT or other test. Classic And Retro Autos in Witton Gilbert, County Durham, offers a £65 plus VAT inspection of about an hour on the hoist, by appointment on 0191 3730086.

It depends on where the rust is. Corrosion confined to non-structural outer skin panels is largely cosmetic, but rot in sills, floors, chassis rails or near suspension and seat belt mounts is structural and must be cut out and welded. Have the car inspected on a hoist and get a written estimate first, and allow for hidden metalwork once panels come off.

The structure first. On a hoist, look at the sills, floor pans, chassis rails, jacking points and the metal around suspension and seat belt mounts, pressing and tapping anything suspect. Watch for filler, fresh underseal and plates laid over old metal. If the car has been tested since 2005, its MOT history on GOV.UK lists past failures and advisories.

In FIVA's Charter of Turin, preservation means caring for a car to stop further deterioration while keeping its present condition. Restoration goes further, replacing missing parts to return the car to how it looked at an earlier point. Conservation sits between them, stabilising the car without altering original material, and repair simply makes it work again.

Only in certain cases. GOV.UK says you must tell DVLA if you replace a chassis, monocoque bodyshell or frame, or if the V5C details change, such as engine size, which you update on the V5C itself. For a new chassis or bodyshell, use form V627/1 with receipts and photographs of the old VIN. Most panel, sill and floor repairs need no report.