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This one's a bit of a legend! The place in question is near the little village of Penmachno in Snowdonia, rugged hill-farming country.  One of the local farmers was fed up with the Hawks from 4 FTS (Flight Training School) using his farm as a reference Point during low-level flying. He claimed that the jets upset his sheep, especially at lambing time.  So, he got tired of phoning the base at RAF Valley to complain and decided to voice his opinion on the shed roof.  Naturally, it was spotted by the eagle-eyed aircrew and word soon got around. Not only were the Hawks coming to see the message, but just about every pilot in the RAF and Fleet Air Arm heard about the graffiti and came to see it! Then, the USAF got to hear about it!

The poor old farmer had his own daily airshow... http://www.b3ta.com/questions/failed/post69334/

The guy who posted the photo on his website has some superb shots of the low-level training in N Wales. Check this out: http://www.targeta.co.uk/index.htm

Biggles a very old British air ace story character from the 1930's. The stories were immensely popular in the U.K. - a British institution to say the least.   http://en.wikipedia.org/wiki/Biggles

"Piss Of Biggles"