If it was a Gatso, you're safe

They aren't type-approved for oncoming traffic yet.

The way they work is as follows:

-An initial speed measurement is taken using RADAR.
-A set time later, two photos are taken (hence the 2 flashes). These pictures are a known time apart.
-From the distance travelled in the interval between the 2 pictures, your speed is calculated using the white markings on the road.

There's a good chance that the gatso would only get one picture of oncoming traffic (as you are travelling towards it, I reckon you'd be past the camera before the second picture was taken), so they wouldn't be able to measure your speed

Neil.