vw polo 1.2 tsi auto 2011 - noise from rear axle-suspension - GNcy

Hi, the last month i noticed a strange noise coming from the back of the car. It seems like the rear axle is the problem and it becomes audible after traveling for 10-15miles (after warming up and not before). The people at an independent garage I was sent to, thougt it was the rear suspension bushes so they replaced them but with no result. Any idea ?(The car is under guarantee as a used buy)

Thanks,

George

vw polo 1.2 tsi auto 2011 - noise from rear axle-suspension - FoxyJukebox

Are you quite sure there is nothing stuck(wood/twigs/piece of wire etc) either around the wheels or in the wheel arches or underneath near the wheels?

vw polo 1.2 tsi auto 2011 - noise from rear axle-suspension - gordonbennet

rattle, squeak, screech, knock, drumming, grinding?