Way before the building of Terminal 5 at Heathrow Airport...:
image
...they've had these.
Way before September 2001 too, so unless you're wanting to admit that all right-wing Fundamentalist Christains - including you are terrorists (PROTIP: Timothy McVeigh. Eric Robert Rudolph. Scott Roeder), then I suggest you STFU.
In the Butlins holiday camps, there were both Anglican (Protestant) and Catholic chapels. The Church of England & British RCC sent some of their best vicars & priests to minister there, and holiday camp magnate Sir Billy Butlin ensured that these clergy got everything they wanted.
Sir Billy Butlin was a devout Church of England Christian.
Butlins camps started in the 1930s. The concept of multifaith areas had to start somewhere. Sir Billy brought Dodgem Cars to the UK from America. Quite the forward-thinking chap he was. When his camps were taken over by the War Office in WWII (with an agreement that they would finish construction of such) the government Time & Motion officials were so impressed with the organisation & efficiency of the existing catering facilities there, it was adopted by the British armed forces. Also used in state schools.
As Sir Billy brought Dodgems to the UK, and he had a hand in the formation of The Beatles via his camps (Filey & Skegness), it could also be said that he helped in the establishment of multi-denominational worship, via his Protestant & Catholic chapels in his Butlins camps. Like I say, quite the forward-thinking & progressive sort he was.
That prayer room in Heathrow Airport.
30,000+ denominations of Christianity is a silly idea. At least Sir Billy boiled it down to just two.