Beagle
Yes very strange about Harwell. Especially as I flew over Sizewell whilst out and about with Hairyplane and DamienB the other week. I also recently flew straight over JET at Culham a few days before, again perfectly legally.
Not sure if there are any live reactors on at the Rutherford Appleton Labs out the back nowadays but they are buildiing a Syncrotron thingy at the moment. Still not sure if that requires a no fly zone.
PS not a pilot just a happy passenger on both occasions.