It’s not a “rear end shunt” then, is it. Taking your statements at face value, you were stationary (why?) and he’s clipped you trying to pass. I’d stick to that if I were you, “I can’t be at fault, I was stationary.”
Your first post claims that he ran into the back of you because he wasn’t paying attention, now you’re saying he was trying to overtake you. If you can’t get your story straight and consistent, you’ll get DBFed by the insurance lawyers.
I was stationary while waiting to ‘enter’ the roundabout, looking right and waiting for a gap in traffic. I believe this is the correct way to use a roundabout.
He was behind me and set off before I did! As I mentioned the entry road is single lane and the roundabout double lane. He was obviously aiming for the inside lane of the roundabout to hit me like he did.