I took this pic a while ago in Barking from a public road bridge and it has been quietly in my gallery ever since. There's no train visible in the pic as you can see - it's basically a cityscape that happens to be of rail tracks, some of which are underground 4 rail lines, some of which are mainline. However, I am now working on the cover artwork for an anthology of railway-related fiction (Rustblind and Silverbright - my own specialist small press) and I am considering using that Barking shot as part of the artwork. The picture is not the entirety of the design by any means, only about a quarter of the total cover. Technically I suppose that is commercial use, right? (Though whether I make any money on it is another matter!) What I am not sure about is whether this requires any kind of permission or permit from anyone, or whether it can just be used as a fairly casual shot from a public road? I have seen info about photographers rights and the necessity of a permit for commercial photography, but have been unable to find anything that really covers this specific case. Anybody got any ideas? Thanks in advance!