thanks guys, all very helpfull information there, i will keep the wheels on where they are just now, i know the tread patterns are on the wrong axels but honestly the diff in tread pattern is very very minor with both being identical apart from the groove contour on the outside wall, plus the fronts are both 4mm with both backs at 3.5mm so prob better leaving them as is until i replace the lot,,,, also dont like mechanics anywhere near new wheels unless it is absolutelly necessary as the muppets always scratch them.
i remember when i ran a kwik fit garage i got a call on my day of, i was in b & q with the wife and i just saved something like £20 on a garden item in the sale so was fealing quite chuffed until i was informed that one of my idiot staff just badly scratched a guys alloy who was getting 4 tyres fitted to his ( wait for it ) PORSHE, unbeleivable,,, they had been warned before hand,,,, anyway the alloys where immaculate and he kicked up a storm.
bottom line is we had to pay for replacing the alloy with a brand new original one at a cost of £1500,,,, any damage staff do came out of the depots profit margin so all the staff lost something like £80 out of their salary that month and i personally lost my whole bonus of around £1000 just for that incident.
My b & q £20 discount didnt seem to matter any more on the drive home that day i tell you, 2 days later i had to also sack the guy for theft as well.
Kwik Fit are full of idiots who have very little skill and ever less training,,,, never never never take your car there for ANY work to be done because the little amount of staff who actually have any skill are under paid and rushed through it anyway, that also goes for the other competitors like budget etc,,, all the same.