I think if the wheel bearing is on its way out it makes more of a rumbling noise.
are there any ill effects to steering?
Eg: it pulls to one side when accelerating/braking?
The noise gets louder when turning a certain direction?
That could help determine which side the problem is on, if not both
My dad agrees with your thought about th CV joints, so it will probably be worth changing those anyway, seeing as they were an mot advisory.
Hopefully that'll sort the issue.
If not then further investigation will obviously be required ^_^