The thing is, if Gilroy ducked straight off his core route into a very quiet road, like the B8074, and from there straight up a deserted forest track, without stopping and without getting out of the car, there's an extremely high chance nobody would see him at all. The police theory has him first driving maybe 13 miles back along an A road once he's off his core route, and then getting out of his car (I assume) and showing his face where there are other people around to see him. Why would he do that?
Why would he avoid one particular stretch of road because he knew there was a camera on it (HOW?), but then not worry about being caught by other cameras while engaged in this bizarre detour? Help me out here someone.