I do hope the Grenadiers have a tow rope and have done similar training to the Navy field gun race.Interesting link, which clearly illustrates that the DoE's chosen mode of transport for this Saturday, is NOT, never was, never will be, a Sandringham "gun bus", with a converted box-body as shown in the link/video.
Yer man in the video, said his box-body vehicles are based on ex-army Land-Rover ambulances . . . with which I have some experience, as previously OC of such a Squadron .
Such vehicles are built on the L-R chassis-cab, as (were) delivered from Solihull. The box body of the donor ambulance and the subsequent "gun bus" conversion, is some 18" wider than a normal Defender.
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The vehicle in the photo from the BBC, shown by @orgASMic , clearly started-out as a normal, soft-top (with canvas "tilt"), LWB pick-up Defender . . . with the (relatively narrow) rear "pick-up" body-sides, flush with the cab doors.
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The Sandringham estate, may well use normal, soft-top (with canvas "tilt"), LWB pick-up Defenders . . . with which we will all be familiar . . . for such "utility" purposes as transporting muddy dogs, refreshments, ammunition, dead-birds. It would however seem strange to refer to such a utility vehicle as a "gun bus".
And - as we all know - a normal, soft-top (with canvas "tilt"), LWB pick-up Defender, would be very uncomfortable, particularly for transporting the "older" gentleman . . . and, possibly even dangerous when they are carrying particularly long "bang-sticks".