Another newbie seeks advice on settlement

wow great site and forum.
I've been married for 8 years and am certain - and will get proof! - that my wife is having an affair. She's been frosty for over a year too and here's my main fear: she doesn't pay anything towards mortgage, bills, council tax (I earn more than she does but she works and we agreed ages ago to share bills - she stopped contributing bit by bit and now I pay the lot!).
Should this all lead to divorce, can someone please give me an indication of what she'd be 'entitled to' from me? I would intend staying in the house (I'm paying for it already on my own! She would not be able to and I suspect she has been spending her disposable income on clothes - she always has new stuff and doesnt let me see her credit card bills (as well as her mobile phone, obviously...).
I am 47, she is 39, we have no children.
Thankyou for any advice you can give me on this.
Mark

empireurn,
people will need more details in order to answer this. Read this and then start a new thread answering those questions here .
Tets