Had these symptoms not long after I bought the car. Was caused by uneven tyre wear on one of the rear wheels. That said, only back seat passengers could feel the vibration.
 
4 news tyres its like a new car couldnt believe the difference!!
previous owner had put 98h tyres on the left side and 102 on the right !!
 
4 news tyres its like a new car couldnt believe the difference!!
previous owner had put 98h tyres on the left side and 102 on the right !!
Had the same with mine all the way back from England. Terrible wobbly steering wheel and vibrations. Mismatched Tyres had pretty much had it. Got it back to Spain and put on the nearly new 17's that I had and it's like a different car. So smoooth! I don't have any whirring noises either which I had on the trip down.
 

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