+1... this is usually a symptom of incorrect front vs rear tyre sizes, rather than mis-matched makes.
225/45/18 up front and 245/45/18 at the rears.
Hmm, you have the right sizes then. How many miles have they done? If less than 500 they might not be scrubbed in enough. Otherwise its down to the compounds somehow causing you problems.
700 miles done on the rears, dont know about the fronts as i only had the car 700 miles ago
i reckon i need to change all four corners anyway to a better tyre
Everybody seems to think its the mix of tyres