I think the Royal Mail vehicles are the only ones who are allowed to jump red lights in the UK, even the emergency services aren't supposed to.

Not just the Royal Mail vans, but all security vans are legally allowed to do this if, and only if under threat.

lilgug, I haven't found confirmation yet of your statement about Royal Mail vehicles but refute your statement about emergency vehicles.

In reply to:

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Drivers authorised to use blue lights may only switch them on under certain circumstances, such as at the scene of an emergency or to warn other road users of their presence. While using blue lights drivers are exempt from a number of motoring regulations. For instance they are permitted to treat a red traffic light as a give way sign, pass the wrong side of a keep left bollard, go the wrong way around a roundabout and drive on a motorway hard shoulder, even against the direction of traffic! And Police, Fire and Ambulance services, though not all blue light users, are exempt from obeying the speed limit. Click here to visit a site with this information

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Perhaps you could give us a source regarding Royal Mail vehicles.