Squeaking offside front wheel. Noise stops under braking

We've got a 2006 Nissan Note and there's a noticeable squeaking coming from the driver's side front wheel. It starts after about 5-10 minutes of driving and stops as soon as you touch the brakes, then starts again when you let off them. Also seems to be at 10-40MPH and not over that

The brakes feel fine and there's no noise at all when they are in use.

Any ideas what it might be? I have googled it but it's like looking for an illness, you come back with everything from a minor issue to OMG you are going to DIE!