Top Gear host Matt LeBlanc has been joined by professional rally driver Ken Block for a trip around the streets of London in a Ford Mustang.

The duo surprised a bride and groom and their wedding guests at St Paul’s Cathedral as they motored past, with LeBlanc sticking his arm out of the car window to wave.

Their tour of the capital in Block’s 4WD Hoonicorn Mustang took them over London’s Tower Bridge, where they snapped a picture using a selfie stick.

US actor LeBlanc is apparently still unfamiliar with London.

He was pictured clutching a guide book to London as he navigated the streets with Block at the wheel.

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Filming for the Top Gear reboot is well under way, as the new series of the BBC Two show is due to air in Britain in May.

A seven-strong line-up includes LeBlanc, radio DJ and presenter Chris Evans, and Top Gear stalwart The Stig.

Also on board are Formula 1 commentator Eddie Jordan, German racing driver Sabine Schmitz, motoring journalist Chris Harris and car reviewer Rory Reid.

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AAP