The charter airline must have leased this unit from Latin America.  It shows its previous heritage; TACA I think.  Quite exotic for Manchester.
<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@N02/20606518192/">Inter European B737-300 G-BNGM at MAN</a>