Operating from T1 before T4 was built.  T4 accommodated all KLM (and Air Malta) services because KLM self-handled at LHR then.  The Cityhopper aircraft operated the Rotterdam route.
<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@N02/16848743500/">Cityhopper F28 PH-CHI at LHR</a>