'River Dee' taxis past T2 heading to T1 and the BA short haul terminal.  The 737s were pretty new when I took this pic.  You can see the preparatory ground works for Terminal 4 underway across the southern runway.
<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@N02/23088457840/">British 737-200 G-BGDL at LHR</a>