Letter to today's Telegraph reasonably quotes the Network Rail's "Guidelines for Railway Enthusiasts" and then goes on to quote the bit about informing the DSM at Major stations.
Does Macclesfield quite fit the bill as a major station? and moreover, the gent in question was seeing off a relative, and thought he'd snap some trains whilst on platform.
I just see the whole thing as quite bizarre...picking the low-hanging fruit, to use the politicos' most recent trendy expression...anyone like to hazard a guess at who coined that one (it's a good one mind!)