When Ian Callum decided to revisit one of his greatest hits, the Aston Martin Vanquish, he did it with the simple goal of making it better in every way From the design to the engineering, everything on the Callum Vanquish has been further refined and improved in a bid to fix everything that was wrong with the British GT.

Consider the Callum Vanquish 25 as a new take on an existing car then, only one that’s very exclusive as only 25 examples will be made. Harry Metcalfe had the chance to spend two days in a prototype Callum Vanquish on some pretty epic Welsh roads.

Read More: Bespoke Aston Martin Callum Vanquish 25 By R-Reforged Unveiled In Production Guise

Callum made more than 100 design changes over the original Vanquish and these include new bumpers front and rear made out of carbon that also improve the aerodynamics, together with a new front grille, new door mirrors and door sills, as well as new LED head- and taillights.

These changes are small and subtle, but put them all together and their outcome does make the Vanquish feel like a box-fresh supercar, on the outside at least. Together with the wider tracks front and rear and the nicely matched custom forged wheels, the Callum Vanquish is every bit of a show-stopper as any modern Aston currently on sale.

Similarly, the cabin has also been subjected to a complete retrim and now features expensive leather upholstery, a revised dashboard with a new center part that hosts an infotainment system with Android Auto and Apple CarPlay, a new instrument cluster and, more importantly, new seats, with the driver’s one offering a lower seating position.

Power still comes from a naturally aspirated 6.0-liter V12, only here it makes around 580 HP, 60 HP more than the original Vanquish thanks to a new ECU tune, a new exhaust system, and different camshafts. Customers can choose between a six-speed manual, the original single-clutch automated, or a modern six-speed torque-converter automatic transmission.

As it turns out, the chassis revisions have greatly improved the handling of the Callum Vanquish, which now provides greater confidence to the driver thanks to its new Bilstein dampers, stiffer anti-roll bars and new bushings.

The Callum Vanquish is priced at over $500k before taxes and the cost of the donor car. Yes, the price is enormous, but with a production run of just 25 cars, does it really matter?