Cracking pics there from Grum! 🙂
I jolly well have not got any to show, but with candids, the trick is to have the camera ready to get that quick shot; the longer you’re holding it up, the more aware your ‘subjects’ will become, and that ‘natural’ look will be lost.
A cam with a fast shutter release is essential; many have to hunt to focus and that, and the moment can be lost. Good camera handling skills are vital too; Grum obviously knows how to wield a cam.
Those with flip out adjustable angle screen could be useful, but not essential.
Another trick is to point the cam at something else, then swing round and grab the shot you were really after, lightening quick. Focussing is the issue; manual focusing with a DSLR could well give you an advantage.
And be prepared for people being pissed off. This kind of photography is easier in crowds and busy places, where you can pretend to be a ‘tourist’, and a reasonable explanation/showing the subject the pic on your cam can placate most folk, as most people enjoy a nice candid photo, but some people will react angrily and possibly even with violence. It’s down to your judgement of the potential for danger in the situation.
But generally, anything goes in a public place, pretty much, and no-one can legally stop you taking pics.
The only thing that could cause problems is if the picture is deemed to be a deliberate attempt to identify an individual rather than just a ‘member of the public’; see Robert Doisneau’s The Kiss for such a case, but that was in France, where the Law is different. I don’t think you’ll run into too many problems here in the UK, speshly if it’s in a non-commercial capacity. Obviously be careful if photographing Babylonians, as some of them don’t understand Section 44 of the Anti-Terrorism Act quite clearly enough…