On one business trip when I had time in the mid 90s, I walked all the way around Battersea Power Station (well what was left of it then - walls and four chimneys.) as close as I could get.
From Wikipedia:-
"The giant,
helium-filled
pig seen on the cover was actually flown over
Battersea Power Station for the photo shoot (under the direction of
Storm Thorgerson). On the first day of shooting, a marksman was on hand in case the pig broke free. However, according to Thorgerson, this was considered an "insurance problem", and he was not hired for the second day of shooting. Ironically, on 3 December 1976, during the second day, a gust of wind broke the pig free of its moorings. Because there was no one to shoot the pig down, it sailed away into the morning sky. A passenger plane reported seeing the pig, causing all the flights at
London Heathrow Airport to be delayed[
citation needed]. A police helicopter was sent up to track the pig, but was forced to return after following the pig to an altitude of 5,000 feet. A warning was sent out to pilots that a giant, flying pink pig was loose in the area[
citation needed]. The CAA lost radar contact on the pig near Chatham in Kent, at a height of 18,000 feet and flying East. It finally landed in a farmer's field, without much damage. They then repaired the pig, and flew it up for a third time. The resulting pictures were not deemed suitable on their own (as the clear, blue sky from day three was thought to be much less evocative), and the final image was made as a composite of the power station picture from day one and the pig from day three."