It is a whining/squealing sound, which seems to be coming from the front , near the passengers side I think. Although is hard to pinpoint it.
The noise itself only happens when I have been in the car for a longer journey ( 30 mins or more ) never on a shorter journey. Also the noise does not get worse with the brakes being applied and happens even when I do not use them, so it is not the brakes.
It only happens when slowing down from 20mph downwards. It will start off quite then after about 4/5 times of slowing down the noise will get louder.
If say I stop though, even for 5 minutes with the engine off, I can then drive again for about 20 minutes without the noise happening.