I didn't say that there wasn't one (now or then), only that I couldn't find one, and that an employee told me there wasn't one—and both those facts are true.
There is on just after security to the right in the north terminal and it's been there for at least 5 years.
Also...
"Responding to Prof Colbourne's comments, a spokesman for airport operator BAA said drinking fountains offering free water were already installed at Heathrow, Gatwick, Stansted and Southampton airports."
I didn't say that there wasn't one (now or then), only that I couldn't find one, and that an employee told me there wasn't one—and both those facts are true.