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Unicorns: The rarest cars you can buy

Autocar logo Autocar 18/05/2017

BMW 550i Touring: The 407hp V8 550i may lack the glamour and power of the M5, but those model-unique twin exhausts give the game away on this ultimate Q-car. Most came fully loaded: ensure yours has the useful head-up display and adaptive cruise options. There are around 350 on UK roads today, but the one you want is the estate, with just a handful of the 2010-2017 F10 generation ever sold.

BMW 550i Touring: The 407hp V8 550i may lack the glamour and power of the M5, but those model-unique twin exhausts give the game away on this ultimate Q-car. Most came fully loaded: ensure yours has the useful head-up display and adaptive cruise options. There are around 350 on UK roads today, but the one you want is the estate, with just a handful of the 2010-2017 F10 generation ever sold.
© Autocar

To someone they seemed like such a good idea at the time. These are the halo models that were always doomed to fail – the derivatives that were signed off in a fit of blind optimism, and which would lead to heartbreak in showrooms around the country.

If you’re a second-hand car dealer, you’ll be praying that none of these are offered as a trade-in, because you just know they’ll be a nightmare to shift. But all have merit, and some are future classics, if not there already, and you should get one. If there are any we've forgotten about, please let us know below.

Please slide through the gallery above, and don't forget to go full-screen to view these rare creatures

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