"The Jaguar XJS V12 HE (see link below) has had 2 owners since 1990 and covered 840 miles - an average of 30 miles a year. It has been preserved in storage in hope that values would spiral as a classic in the future. It will be offered to the highest bidder at a Silverstone auction next month with an estimate of £35K to £40K. That's more than the first owner paid 28 years ago - but not if you adjust for inflation. In 1990, an XJS V12 HE cost £34,200 - in today's prices that works out at just over £81,000. If the money had been invested in the stock market, it could now be worth £332,000.
A 1987 Ford Sierra RS500 Cosworth with 10,840 miles on the clock is predicted to sell at the same auction for a more impressive £105,000. Some 21 years ago, the fast Ford would have cost £19,950 new. That works out an inflation-adjusted £55,685, so the Sierra Cosworth at least is almost twice as valuable today as it was when first sold. Proof that picking the right car to bubble wrap for years can be a brilliant investment."
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