On a x rd as you were turning left onto a maincarraige way,therfore not crossing the carraige way you automatically have priority over a vehicle turning right onto same carraige way,who therefore has to cross said carraige way.
Stu the law is on your side
Bit of a bummer there mate,it's so annoying when that happens.
Toyota Dorchester are about the best for body repairs in Dorset, they have won stacks of awards, don't know if Lexus Poole use them or have their own