Humming front wheel (since March) just logged in & you may have fixed it? iff not, jack up the front (both wheels) check out the play in the wheel /hub push & pull the wheel hands on top & bottom of the tyre ie 12 o.clock & six o.clock for play, play there it may be the wheel bearing or top & bottom ball joints. Then spin each wheel with your hand on the tyre, if you feel a rumble through the tyre it's the wheel bearing knackered, as they aren't adjustable. It's not easy to change the bearing without a mig/stick welder & a press but it can be done, or shell out for a new hub assembly from RR at serious £s
Regards Trevor