<p>Parked on a remote stand at Edinburgh, what used to be the ramp at the old Turnhouse and what is now the cargo terminal. From memory 1982. British Airways opertated a back-up aircraft on all Shuttle flights. When the flight was booked to over capacity of the Trident 3, BA would tow a T1 or T2 to the gate and load up and usually depart before the scheduled T3. It was affectionately known as the 'Irish Back-up' since it left before the main flight. Not exactly 'PC' but it was the early 80's.
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Image scanned from an old negative.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/52728482@N05">aceebee</a> from Camberley, UK
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/aceebee/15074112356/">G-ARPL  Hawker Siddeley HS-121 Trident 2E</a>