PP and MH152 - You still don't get it, do you!!! A "position report" is an IFR concept, not relevant at all to the flying you're doing - intended for use at set reporting routes on airways and - arguably more importantly - advisory routes. I'm not sure on this, but I believe CAP413 is intended as a reference document, not a training manual, and to someone who actually has a vague idea about the world outside GA it is perfectly clear.
PP - stop trying to second guess ATC and clogging up the airwaves with the sound of your voice - if they're really interested they'll ask you, but the chance of them being so interested is remarkably low. So shut your cakehole and leave the frequency available for anyone with a mayday or a pan to be able to use without waiting half an hour! Sorry to rant, but I've been inconvenienced on multiple occasions and in one case arguably endangered by people passing just the kind of guff you mention.
Off to take some blood pressure pills and lie down for a minute....