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Guy Miller inspects crevices in stonework.
Crack bat squad drops in on Blenheim Estate's famous Vanburgh bridge...
Abseiling ecologists have been monitoring rare bat colonies roosting inside Blenheim Estate's historic Grand Bridge.
The unusual survey is taking place ahead of a multi-million pounds restoration project for the bridge, designed by 18th century architect and playwright John Vanbrugh, which gets under way next year.
Guy Miller, a licenced bat ecologist with qualifications in aerial rescue and tree climbing, abseiled down the side of iconic bridge at Sir Winston Churchill's birthplace to inspect features which could support roosting bats and breeding birds.
High-specification thermal imaging cameras and bat echolocation detectors are being used to identify any roosts.