It was March 1991 so they've already carried out the 25 year celebrations. There was a big gathering amongst colleagues in the Terminal, speeches from the MD etc. There was some local media attention about it and a half-hour special from ITV Anglia news broadcast from the new Satellite 1 area.
EDIT... Here's the link to ITV Anglia news' broadcast...
http://www.itv.com/news/anglia/2016-...h-anniversary/