After about 90 mins the light was starting to go and I hadn't managed to find my quarry, so I made my way back to the car and carried on down the always lovely A1.
The trip wasn't a waste, however. I did manage to find two species of hemipteran and one beetle that were new for me.
I also found Agonum fuliginosum, Anchomenus dorsalis, Agonum thoreyi and Platynus assimilis.
I will have to return again for another look next winter or even better find my own along the river Cam.