Ah mate, I'm so sorry about you grandad, away from the impending court case, is he ok now?
Back to it, get yourself geared up for the case, lawyer, knowledge of limits, speeding fines, roads, proof of where you had to be.... etc
I imagine they most certainly will need, not want, to give you points and a hefty fine, mainly in view that despite the fact there was no one working on it, you could have spun off the road around all the highway agency road equipment causing yourself and your brotther to be seriously hurt or even killed, and cause thousands of pounds worth of road and collateral damage.
Best of luck, hope all is well with your family, I very recently had a similar family emergency.