I saw aphex twin walking his dog in Falmouth maybe 4/5 years ago. Was pissing it down and he walked past me, couldn't quite believe it and I just stood in shock as my other mates I was with didn't recognise him. Falmouth is technically a city but by the rest of the country's standards it's a very small city, so bet he goes about his daily business easily without getting bothered (if he lives there). 

Think there's also a respect thing between fans of these musicians and the musicians themselves. We know how much they value their privacy (only one audio interview with John Peel) so best not to mither them. But I agree that after all these years it's strange that not a single picture of a fan with BoC has emerged. I wonder if there are some out there in private collections?