Are you saying that both lifts at Heathrow Tower were working fine the night before? I was working at Swanwick that night (software delivery and AIRAC) and the brief was that they were out and the operation was being conducted from the old tower, a decision would be made at 0200 whether or not it was likely they could go back to the new tower. If they hadn't gone back we were briefed to expect a rate of 30%, which is what I was querying in my post.
Both lifts were out as I understand it during the night shift. Internal fixed then broke whilst this was happening with two members of staff stuck.
Did they leave the new tower during the night and run the operation from the old?