NOT

Convertible values – I know, hardly earth-shaking news this one. It happens every year although the Audi A5 2.0 TDi seems to suffering worst of all.  HOWEVER…. If you are in the market now is the time – with a view to offloading by July latest, and it will give you a depreciation free ride during late spring and early summer.

BMW 5 Series GT – Four years and a facelift later and the 5 Series GT is still struggling to find friends. And that’s true even more of the pre-facelift cars. Expect values to be on a par with the standard BMW 5 Series saloon, despite the four door costing some £5000 less when new.

Porsche values While Porsche has been on a roll recently with values showing little decline over the summer, this month sees a change as more stock is available.

As you might expect, the Boxster has been hit hardest as we all start to put on our scarves and gloves for the winter. It’s one car that won’t be on Santa’s sleigh this Christmas.

Richard Crosthwaite is the Prestige Car Editor at Glass’s Guide.