ExCeL (an abbreviation for “Exhibition Centre London”), designed by Moxley Architects and built by Sir Robert McAlpine opened in November 2000. Almost twenty years later, on 3rd April 2020 it was reopened in its temporary guise as NHS Nightingale by HRH Prince Charles.

https://www.bbc.co.uk/news/uk-52150598

In less than two weeks the exhibition centre has been transformed to provide facilities for the care of, initially 500 and ultimately 4000, Covid-19 patients. The first patients arrived on the evening of Tuesday 7th April.

https://www.itv.com/news/2020-04-08/nhs-nightingale-begins-treating-first-patients-during-coronavirus-outbreak/