Saffron my cat has gone missing.

I live in Welwyn Garden City and she has been missing for a week and a day, (1st Feb.06) and was some time during the night.
I know for some cats this isn't long but we have only had her about a month as we got her from the Blue Cross Animal Shelter in Kimpton and she doesn't know the area that well.

She is a striped tabby and she's 9 mths old, she doesn't have a collar on, that disappeared the night before she went missing.

She has a shaved patch on her left side where she has been done. She is also micro chipped.

She is a very friendly cat and I am worried some one might have taken her in thinking she is a stray, I miss her a great deal and am willing to pay a Reward.

She has a soppy nature that loves attention but doesn't get on with other cats and will hiss at the toms that are twice her size in the street!