Thanks Pete.
BTW I found the horse:
"Big Red Nose Cover Up
The Hackpen Hill white horse came over all red in the Big Red Nose Cover Up for Comic Relief... It's 90 foot square, one third the size of a football pitch if you're asking, it sits on a hill 600 feet up and most of the time it's white… But on Friday 16th March, between 10:00 am and 1:00 pm, if you happened to be driving along the B4041 or the A361 near Broad Hinton and looked up at the gentle slope of Hackpen Hill it would have looked distinctly red."
VBB