I remember getting off the plane on the tarmac at Heathrow, before they forced everyone to deplane at the terminal. Grey. Cold, dark and grey as far as the eye could see. If it had been the United States with a sky like that, you could have expected 2-3 inches of rain in an hour, but the weather never changed. It just was like that... cold and grey with some drizzle or the constant wetness that never seemed to stop.
Cold and grey. Sometimes, being stuck in the north Atlantic has it's drawbacks. Hyde Park is an amazing feat of gardening and landscaping, though. The grass was perfectly manicured and soft.