I sent a letter asking some questions to Sharon on: 25th January 2014, and yesterday I didn't recieve my Q+A back, instead I recieved this signed photo from her instead, she used her own envelope, and mine wasn't returned, still really happy though.
address I used was:
Sharon Osbourne,
c/o Regent House,
1, Pratt Mews,
London
NW1 OAD
Here is the pic:

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