ACPO guidelines are summons for 76 and above in a 50 limit - so narrowly missed a fixed penalty.
The mags' sentencing guidelines are 6 points or a short ban and a fine of 75% to 125% of relevant weekly income (take home pay). Absent any aggravating factors, you would be bloody unlucky to get a ban for that speed.
Currently, you are required under s. 172 RTA 1988 to name the driver. If you fail to do so, absent any defence you would get 6 points (DVLA endorsement code MS90 - can be costly at insurance renewal time) and a large fine (capped at ?1000). Many talivans have CCTV systems which record the numberplates of bikes (and other vehicles).
The device used appears to be a Lastec LTi2020 with Concept DVD system. This is a lidar device which measures speed in approx 1/3s, and has a beam divergence of 3 miliradians - ~60cm at 200 metres. There is no general prohibition of prosecution where 2 vehicles are in the picture, but the court must be able to be certain (beyond reasonable doubt) which vehicle's speed was being measured. For radar devices such as the Gatso, this can be more of an issue. There are documented issues with these devices recording the speed of larger vehicles at the edge of the beam cone when bikes are targetted, but the vehicle speed can be be determined from distance over time from the video, so it would be almost impossible to discredit the evidence unless you actually weren't speeding (or at least within the tolerances of such techniques).