From my understanding it depends on the insurance company, which can differ from 10 - 15 year old cars. A broker will have multiple Insurance companies to choose from, so some might suit your car more than others for this reason.
Though I have heard of some insurance companies classifying a classic, much newer as it was a small product, specialist manufacturer / model.
Mark's right - it really does depend on each insurer with regards to age.
True classics are defined more by their use than their age.
For example, a 1983 190E used as the main vehicle, kept on the drive and doing 8000 miles per annum is just an old car but the same vehicle used as a second vehicle, kept in a garage, doing limited mileage and insured for SD&P only could certainly be classed as a classic.
If you speak to a broker they'll be able to advise you of the best policy type for your specific circumstances. By all means give us a call - we'll give good advice and make sure you get the right cover.
Have a 1992 Honda CRX-ESi on a classic policy with Hagerty. Their rules are car has to be 20 years old, and drivers have to be aged 30 minimum. Policies are not subject to any excess and include Fully Comp Cover, UK and European Breakdown and Recovery. Also includes an agreed write-off value. This is on a 3,000 mile per year basis. My quote was £320 (2 drivers) and Footman James were also quoting a similar premium. Happy with that and the Hagerty underwriters are Hiscox so top notch cover.
AIB understand your special Mercedes deserves a special insurance policy. We have a refreshing attitude to insuring high performance, modified, imported or classic and vintage cars and deal with the UK’s leading insurers. We offer discounts for length of ownership, where the vehicle is kept overnight and limiting the mileage and can also cater for those clients who need higher mileage and business use.
To obtain a quotation please call the team on 02380 268351 or visit us atAIB Insurance