Most of these are taken locally to me in Gloucestershire. All are with a Canon 350D and 50mm f1.8, stitched with PTGui and blended with Enblend. The originals vary in size from around 15-45 megapixels.
I generally metered from a green area to give me "average grey", then locked these in manual. Remove polarisers so that natural unevenness from the sky is not picked up as "banding" in the final image.