I assume this aircraft operated the Exeter-Guernsey flight.  'HO used to be a regular on the BHX-LGW route - I have shots of it in BHX in the early 1980's.  This was taken in the late 1980's.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/130275500@N02">G B_NZ</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/130275500@N02/27434881154/">Brymon Twin Otter G-BIHO at GCI</a>