I don't see the problem with it. Your taking a photo of a bus. I don't see what the problem is.

It just seems some people complain for the hell of it. I've had staff approach me on the odd occasions when I've been photo at Haymarket yet I've been on public land

I've had a driver on the X8 round mine question why I took a photo of his bus. I said I do this every day. And he said. Werid thing to do