For some reason there is a part of the Establishment that is starting to become rather paranoid and over reacting to people doing innocent and everyday things. Maybe it is hyped up in the media with tacky "news" stories about paedophiles and/or terrorists on every street corner or maybe is is just a gross over reaction by those who have an over rated sense of their own importance, \ \ you decide, I couldn't possibly comment : .
I don't think you will have any problem with a farming and photography tour of the UK if, like me, you always approach the drivers first and ask permission, after all, it is basic courtesy. If you do decide to come over then I will look forward to your pictures.