Engineers working on Britain’s new high-speed railway have begun excavating the first of five shafts that will provide ventilation and emergency access to the 10-mile long tunnels they are digging under the Chiltern hills.

Once complete, the 78m deep shaft near the village of Chalfont St Peter will be topped with a headhouse inspired by nearby barns and other agricultural buildings to help it fit into the surrounding landscape.

A new video, explaining progress on site and including a drone flight within the shaft, can be found below.

Set back from the road, the single-story building will be wrapped in a pre-weathered grey zinc roof with doors and vent openings picked out in a dark bronze colour and a simple blue brick base.

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