interesting question Flash :o)
my good memory got me through school and uni with minimal effort it has to be said. It's not photographic, but I do recall things very easily. Now it seems my head is just full of useless info .... but, my recall is as good as ever. When I'm asked a question about something I should know, the answer literally pops into my head before I've really thought about it, and 99% of the time, I'm right. I just say what I see, as it were lol As you said champers, sometimes it's stuff I don't even know I know, but my brain's stored it away somewhere for later :o)
Unfortunately, my memory for 'things I need to do today' is shockingly poor, and I find myself writing lists and reminders these days. Funny how memory works really.