One of BY's earlier version 737s. These were very familiar sights around the UK's regional airports during the 1970's and '80'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@N02/16283865527/">Britannia B737-200 G-BADP at EMA</a>