If you leave the country of your own accord then you will probably not receive a ban from coming back to the uk at a later date - although it would be at the discretion of the ukba immigration officials.
If you are to travel back to the UK for another visit at a later date I would advise that you apply directly to the nearest UK embassy for a visitor's visa before you travel (disclosing and explaining the reasons for your overstay).
You could contact the UKBA but practically they are unlikely to make a note on file until you have left the country of your own accord, I suppose it could not hurt but really the key issue for you is to leave without causing the UKBA any headaches.
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