Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
posted on the secret projects forum that it was 'an attraction in a London exhibition, on the theme of 'the house of the future' and how we'd live then' (q.v. https://www.secretprojects.co.uk/threads/early-flying-car-designs.4480/page-2).
It did look like big airframe at first glance but a smaller twin makes sense.