The note reads:

IF YOU HAVE FOUND THIS NOTE YOU MUST BE ENGAGED IN DEMOLISHING ONE OF THE FALSE COLUMNS THAT HAVE BEEN PLACED IN THE FOYER OF THE SAINSBURY WING OF THE NATIONAL GALLERY. I BELIEVE THAT THE FALSE COLUMNS ARE A MISTAKE OF THE ARCHITECT AND THAT WE WOULD LIVE TO REGRET OUR ACCEPTING THIS DETAIL OF HIS DESIGN.

LET IT BE KNOWN THAT ONE OF THE DONORS OF THIS BUILDING IS ABSOLUTELY DELIGHTED THAT YOUR GENERATION HAS DECIDED TO DISPENSE WITH THE UNNECESSARY COLUMNS.