Well that was a surprise to be reminded of "Alternative Photographics" after all these years! I did indeed often talk about my ideas of a red London bus going over a bridge, and the bus being the only colour in the image. In fact I can still see the image in my mind's eye. This bridge was more himp backed, and the bus looms over the brow. However, the facilities available to the amateur at the time (and an impecunious amateur too) just did not allow me to realise my masterpiece. The one fellow member of AP I was in touch with, and who could have corroborated my story, died 18 months ago of mesothelioma.
I have to say I am alarmed that this company can claim a copyright on the whole concept of a red bus in a B&W image. That is a complete travesty of justice.
Interestingly, having declared how great the Color Accent facility is, I then never used it again. If I want that effect I can achieve it whenever I want in Photoshop