These are stunning, for me T1,GR4,F15,GR9 are my pick of the very very fine bunch. They are the sort of images that you see on the walls as acrylic panels at BAE,RR and associated engineering shops.
We holiday in Wales regularly. Just up the valley from Machynlleth is a place called Corris...basically between Dolgellau and Mac...the jets fly down there really low, and the valley sides are high. I love the place, but have never taken the camera up there...
It's a regular haunt for photographers, though. Quite a nice hotel on the junction with the Tal-y-llyn road, too.