Let me guess; the B1050 road between Earith and Willingham?
Yep. Same type of incidents nearly every day, especially on the long straight bit where it should be easy to spot a cyclist and plan a nice overtake as generally everyone is heading in the same direction but everyone is trying to overtake each other to get to the A14 car park 5 seconds quicker, then the other favourite bit is where the river runs next to the road and there's a nice blind bend. I groan inwardly with "not another one!" as I hear the person behind slowly gain revs to pass 10 yards before the blind corner (and they always try and do it in 5th gear from 20mph). If I take primary it still doesn't completely deter them so often I have to stick an arm out and take what I call "mega-primary" and 90% of the time my actions are proved correct as we meet someone coming the other way around said blind corner. My reward for taking positive action in order to not get squished? BEEP BEEP SHOUTY SHOUTY and a punishment pass just as close as if I'd done nothing and allowed them to bully through in the first place