The firm says that the third generation of the model – first introduced in 1996 – benefits from aggressive styling and accross-the-board improvements.

CAP Monitor Editor Jeff Knight said: 'Historically the SLK has suffered something of an image problem, sometimes unkindly described as a car for the more well-heeled hairdresser. The new more aggressive design removes that image problem and ensures it will appeal to a broader spectrum of buyer.

'This new SLK is vastly improved in all areas. The design cues of the interior, borrowed from the high-performance SLS, add significant appeal in particular.  Every other aspect of the car has been enhanced too and all of this is reflected in a very strong forecast residual value.'

In addition, the introduction of some AMG branding to the range adds more weight to its sporting credentials. The SLK 200 AMG Sport Auto is forecast by CAP Monitor to retain 49.5% of list price after 3 years and 60,000 miles. This represents a major premium over the outgoing SLK Roadster which is currently forecast to retain 39% of cost new.