While his subjects love him--he is, after all, their future King--HRH Prince Charles is known to be grimly insistent on promoting certain of his pet causes.

One is "traditional" British architecture. Recently, another has become the greening of transportation.

To that end, the Prince will bring a display of environmentally friendly green vehicles to The Mall, which leads from Trafalgar Circus along the edge of Green Park up to the gates of Buckingham Palace, on Sunday, September 12.

The Start Eco Car Spectacular kicks off with a race from Glasgow to London between various green cars and the Prince's own railway train--which runs on biodiesel made from recycled fryer grease rather than conventional petroleum-based diesel fuel.

The Think City racer, with Kevin McCloud (left) and Roger Saul (right)

The Think City racer, with Kevin McCloud (left) and Roger Saul (right)

It's all part of Start UK, a broader initiative by the Prince's charity to help his subjects "lead more sustainable lives" and demonstrate "a more energy-efficient, cleaner, and healthier future."

The free green-car display, mounted by EVcup entrepreneurs Kevin McCloud and Roger Saul, will be part of a 12-day "Garden Party To Make a Difference," which adds a social cause to the traditional royal summer garden party.

Gardens on display from September 8 to 19 include the Prince's own, at Clarence House, along with those of Lancaster House and Marlborough House. Tickets cost roughly $23 (£15).

Ah, the British.

Security stepped up for British grand prix

Security stepped up for British grand prix

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