On 26 Jan, 13:31, Roland Perry wrote:
And is there an exit-only gateline somewhere? Very close to the edge of
the building, perhaps (so that the corridor along the buffers is
"airside")?

The entire front wall of the station. The whole main shed is airside.
The whole design does seem to be based on the majority of passengers
being sent outdoors as soon as they arrive, which is bonkers.

There's just one set on the diagram I have, and it's not clear if inside
or outside the building. If it's just outside, is it perhaps inside the
greenhouse structure visible here just left of the 'clocktower':

Yes. You can see in that picture there's a brick veranda in front of
the main front wall, which will be outside the gateline but inside
glass doors, so there might be a narrow indoor route to the stairs to
the tube station.

U