Actually, I'm a bit lost on the actions of TP1...
Why would he be exiting the roundabout in lane 2a dn indicating / moving to lane 3, when lane 3 ends in a 100 yards or so??
You've already said your missus swerved right, hit the kerb etc etc, so that clearly puts you both off the roundabout and onto the desired exit, so it's not like he was trying to take a different exit and continue round the roundabout..
Why would he be exiting the roundabout in lane 2a dn indicating / moving to lane 3, when lane 3 ends in a 100 yards or so??
You've already said your missus swerved right, hit the kerb etc etc, so that clearly puts you both off the roundabout and onto the desired exit, so it's not like he was trying to take a different exit and continue round the roundabout..