Legally he is at fault, but you put yourself at significantly more risk by riding up the inside where there is a possibility of a vehicle turning left:
Lower probability of being seen=higher probability of getting hit*
*Sadly even doing things correctly, (like overtaking instead of undertaking), can still mean you get hit by arseholes not looking/indicating when they turn, however being more visible to drivers at least improves your chances a bit.
Legally he is at fault, but you put yourself at significantly more risk by riding up the inside where there is a possibility of a vehicle turning left:
Lower probability of being seen=higher probability of getting hit*
*Sadly even doing things correctly, (like overtaking instead of undertaking), can still mean you get hit by arseholes not looking/indicating when they turn, however being more visible to drivers at least improves your chances a bit.