QUOTE (justforthepictures @ Tue, 14 Aug 2012 - 20:39)

What makes you believe you were detected at the time? The system may not have been running at that time.
Same happened to me a few months ago I was going approx 38 on a road (dual carriageway with a stupid 30mph limit) and when rounding a slight bend I saw a mobile camera van parked in a slip road with the rear of it facing coming traffic. I thought I was caught but never heard anything.
Also about 100 yards after where the van was parked is a Truvelo Speed Camera (needless to say I was going under 30 when I got to it)