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We all know Range Rovers aren't cheap cars.

The most affordable version of today's luxury SUV starts at £107,530, while the priciest model available from JLR dealerships costs more than £200,000.

But there's a one-off variant that is more than four times that top-end price.

Created by London-based modifier Overfinch in an ultra-luxurious collaboration with prestigious British gunmaker Holland & Holland, it has pushed the iconic 4x4 into uncharted territory.

In November, the two premium brands announced a run of 25 special-edition Range Rovers carrying six-figure price tags, each equipped with a bespoke shotgun cabinet in the boot and a pair of ultra-exclusive firearms.

However, the final vehicle in the limited-run series is a bespoke commission that has taken things to another level entirely: the first £1million Range Rover.

The £1million Overfinch Holland & Holland Bespoke Commission a one-off Range Rover described as the 'singular expression of British craftsmanship'

It comes with a sliding walnut-and-ash Cellarette containing a bespoke gun-and-drinks cabinet

The Royal side-by-side shotguns alone cost around £370 for the pair, meaniing they account for almost half the million pound price tag

The Overfinch Holland & Holland Bespoke Commission is a true one-off, described as the 'singular expression of British craftsmanship'.

The vehicle was conceived for the discerning shooting enthusiast and collector, drawing inspiration from Holland & Holland's famed 'Royal' side-by-side shotgun.

The result, the companies claim, is 'the most luxurious Range Rover ever built'.

And while the other 24 examples were already lavish, the 25th car raises the bar even higher, with elevated materials and craftsmanship never before seen in one of the British-built SUVs.

Based on the extended wheelbase Range Rover SV, customers can choose which engine they'd prefer. We believe this one packs a 4.4-litre, twin-turbocharged V8 with mild-hybrid assistance to produce 615bhp.

In 'standard' trim, it can accelerate from zero to 62mph in 4.4 seconds and reach speeds of 162mph flat out – though it's unclear if Overfinch has tweaked the powertrain to compensate for the additional artistry inside and out.

Finished in a deep, lustrous black paint, the exterior is accented with gold detailing across the grille, side vents, wheel spokes and rear trim for what Overfinch says is a 'heightened sense of sophistication'.

But it's inside where things become truly extraordinary.

Overfinch and Holland & Holland commissioned 25 of the shooting-inspired Range Rover, but this last example is the finest of the lot

The back exterior is accented with gold detailing across the grilles. There's gold on the side vents, wheel spokes and rear trim too

The walnut and leather materials on the dashboard, door insets and steering wheel are the same as those used on the high-end shotguns stowed in the boot cabinet

As you can see, no expense or effort has been spared to make this feel like the most opulent interior in a Range Rover yet

The cabin is trimmed in a lighter colour scheme than the green-and-tan interior used in the other 24 vehicles.

The one-off combines warm ivory and black leather with more walnut veneer than you'll find in a second-hand furniture showroom.

In a nod to traditional pheasant shooting, intricately embroidered game birds adorn the seatbacks, while contrasting H&H monograms feature on the headrests above.

The bespoke touches continue with a handcrafted 'moorland marquetry' design on the deployable table between the rear seats.

According to the company, the intricate artwork tells 'a captivating story inspired by the British countryside'.

It explains: 'When closed, the tables reveal a tranquil moorland landscape. As they unfold, the scene expands to depict game birds taking flight across the horizon, transforming a functional element into a remarkable work of art.'

The cabin is trimmed in a lighter colour scheme than the green-and-tan interior used in the other 24 vehicles. For the Bespoke Commission, its ivory with contrasting black piping

In a nod to traditional pheasant shooting, intricately embroidered game birds adorn the seatbacks, while contrasting H&H monograms feature on the headrests above

The one-of-one car also has handcrafted 'moorland marquetry' design on the deployable table. Its intricate artwork tells 'a captivating story inspired by the British countryside'

The one-of-a-kind Range Rover was unveiled at this year's Goodwood Festival of Speed and is already sold to a - we imagine - keen huntsman or woman

And it becomes even more extravagant in the boot.

Like the other 24 commissions, it too features a sliding walnut-and-ash Cellarette containing a bespoke gun-and-drinks cabinet.

This includes eight matching crystal glasses, storage for two bottles and a cigar humidor.

But the pièce de résistance is the storage compartment housing two matching Holland & Holland Royal shotguns, which are included with the vehicle.

Costing almost £400,000 for the pair, the firearms account for nearly half of the Range Rover's seven-figure price tag.

Kevin Sloane, ceo of Overfinch, said: 'For five decades, we have worked with clients across the world to create vehicles that go far beyond specification, becoming deeply personal expressions of taste, craftsmanship and individuality.

'This one-of-one Holland & Holland commission demonstrates what is possible when British handcraftsmanship, exceptional materials and true bespoke capability come together.

'While proudly rooted in the UK, our outlook is inherently global, and it is through commissions such as this that we continue to respond to the ambitions of a truly international clientele seeking something entirely unique.'