BBC News - Chill out, save energy, no sweat
A glance around the lobby of the Marriott Hotel in Kensington reveals no sign that the unsuspecting guests are part of a remote-controlled experiment.
The chillers have been turned off by a signal from a computer in an office miles away.
Do the punters notice? They do not. Are they wallowing in a pool of perspiration when I return later? They are not. Has any customer complained about the temperature whilst this six-week experiment in the heat wave has been underway? No.
Has anyone even noticed? Apparently not.
Over an hour, the temperature of the pipes rises from a very cool 4C to a pretty cool 6C. Small wonder no one can tell. If the experiment works Marriott may ratchet up the switch-off time to see when people start to notice.