[doughboy]

Cheers for the heads up OP..

Our Tom Tom knows which gantries have cameras on, so it only beeps & countsdown for the correct gantries, and in any case you can see the bottom of the camera boxes before you get to the gantry.

I run past at a GPS speed 5mph over the limit (as cameras measure real speed not car speedo speed), so the car says about 10mph over the limit. no problems.

Same as average speed SPECS zones, if the limit is 50 then you can do a steady real 55 OK, which is 60 on your speedo, so you pass everyone.

Again the Tom Tom know the SPECS average zones and it displays your average speed in a pop up window so you can always drive fast enough to keep your average to the limit +5.