Sinkholes

(Channel 5 documentary series, 2017)

Includes a feature on the incident in March 1988 in Norwich when Eastern Counties VR266 (RAH266W, a 1981 Bristol VRTSL3/Eastern Coachworks), fell into a sinkhole caused by a disused chalk mine.
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It's punctuated with nice footage of a much older VRTSL2, Eastern Counties VR385 (OCK985K), new in 1972 as Ribble 1985 and now preserved at the East Anglia Transport Museum:
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There's a third VRTSL in the show, it's Eastern Counties VR294 (VEX294X), albeit in model form:
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(thanks Reg Vardy)