BUZZING Magsafe AC Power Adapter pack

My Magsafe AC Power Adapter pack is making a buzzing noise when it's connected up to the electricity! I've tried it in different sockets around the house and it's still making the same noise.
Don't know if anyone can help or reassure me before i contact Apple UK
Regards,
Terry

All that you need is a standard international plug kit. The adapter itself will work at any voltage. Apple has an international kit -> http://store.apple.com/us/product/MB974ZM/B/apple-world-travel-adapter-kit?fnode =3c.
Clinton

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