""Mach Loop" in North Wales looks like an awesome place! Anybody been there?"
(manually quoted to avoid copying the videos)
Actually, yes, I've been there and it's quite an experience! My family and I were traveling in Wales several years ago and stopped at a mine that was open to tours. As we were leaving we heard the most incredible jet sounds and as we made our way out to the edge of the valley we saw flights of jets roaring past at what seemed like eye level. Now the valley itself was fairly deep with steep sides and we were part way up one side so it's difficult to estimate how far AGL the planes were passing but it was definitely a LOW level training exercise. Really pretty amazing and my sons just stood wide eyed and slack jawed as the jets streaked past.
Even without the "Mach Loop" northern Wales is well worth a visit, especially if you're into history. The amazing string of castles, the magnificent scenery, the friendly people, the food, and especially the beautiful (if unintelligible!) Welsh language make the area someplace special to see.
I'll have to see if I can find a photo to scan. Hard to believe that it was only a few years ago but it was actual film back then, not digital!