Accessory Charger making odd noise (UK ETA-U90WE)

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http://androidforums.com – Bit of an odd question....recently I have noticed that my Note II charger that came in the box is making a whistling noise. I dont know if this is a recent thing or if it has been doing it since new as I usually this charge in the office and there is a lot of background noise. Anyone else's doing this? (Charger is a UK, 3 pin, ETU-U90WE) It only makes the noise when charging / drawing current. I have stopped using it just in case it is faulty. Sent from my GT-N7105 using Tapatalk 2 (General)