A 1953 Rolls-Royce Phantom IV State Landaulette, formerly belonging to the royal household and used by the Queen, is going under the hammer.

The modified luxury car will become available to buy at Bonhams’ Goodwood Revival sale on September 8, with an estimate of between £1 million and £2 million.

One of only 18 ever made, the limited-edition Phantom was used by the royal household for more than 40 years, with the Queen and Duke of Edinburgh travelling in it all over the world.

The car has been specially fitted with higher than normal seats, an emergency blue light, an early version of air conditioning and electric windows.

A transparent Perspex panel replaces the normal glass rear windscreen. This specially-designed feature was installed to improve visibility, increase the amount of light entering the interior and enable people watching the car go by to get a good view of its royal passengers.

It’s not the only royal Roller being offered at the September 8 auction. A 1960 Rolls-Royce Phantom V State Limousine also used by the Queen and Prince Philip will go under the hammer with an estimate of £1 million to £1.5 million.

Additionally, there’s a 1979 Rolls-Royce Phantom VI Limousine that was loaned to the royal family, with an estimate of £400,000 to £600,000, and a 1985 Rolls-Royce Centenary Silver Spur Saloon – the 100,000th car built by the manufacturer – that was used by Princess Diana and is expected to fetch between £80,000 and £100,000.

For the keenest Rolls-Royce enthusiasts, there are also two private number plates going up for sale – RR1 and RRM1.