I've been doing some checks, when the engine is running there is definitely something on the left side where the drive belt runs, I put a long screwdriver on the power steering pump and it sounds noisy, but I've also noticed something on the front driver's side which sounds like a wheel bearing, need to follow up when the weather picks up again.
Mine seems to be worse at 1800 to 2000 rpm in any gear, and worst I heard it was with 4 people in on an incline on the motorway then it really started to buzz.