My logic on making them free is simple, as am still nailing the perfect workflow and combo of apps and exposures to get a good mix of speed and range, it seemed a good idea to make them free. The back plates were done on my HTC One M8 phone (as when you have two kids with you , the last thing you want is to be carrying a heavy camera, tripod and lenses...trust me lol.)
Barnard Castle - The Vault
Barnard Castle - The Moat
Barnard Castle - -exterior
Barnard Castle - Far Exterior
Tynemouth Priory and WW2 bunkers etc
Enjoy and feel free to use on anything non commercial all HDRI are at a resolution of 5376 x 2688 and are taken with differing amount of exposures (depending on how much my kids were harassing me at the time ;) ) If you do anything that looks nice with them I've love to see.