Spousal maintanence and what i should be paying

hi guys.

I left my wife and child (now 2.5yrs old) after 11 years of marriage. no one else was invloved judt broke down. we have been in good communication since and i have been paying half the bills and mortgage in the house we both had which she has stayed in. she has agreed for us to sell the house as we ahve a large loan secured on it which we need to clear. i have been paying just over 15% net income as child maintanance and the balance of the child care (another £112 a month).....she has now decided with her parents help to stay in the house but she is not sure if even after they pay large chunk of it off she wont be able to afford bills and mortage. She has now started mentioning Spousal support...something her solicitor mentioned....mine has not mentioned it to me...now i in no way want to NOT pay her what she deserves.....but i just done want to be taken in such a way that i cant afford to buy a house close to my son so i can then better share the responsabilities which my wife is having 70% of at the moment.

she earnes about £1000 net each month and has some futhyer income which is no more than £30 a week.

i earn £2600 net each month.

i realise i wont get specifics...but will she qualify and any idea roughly what i may have to pay...

she dropped her hours at work as a joint decision....and i could suggest i pay for the extra two days child care and she can go back full time.....

any help would be great...and as ai say i just want to work out what is both fair and right....i do not want it to ruin our good friendship which thankfully we have retained.

paul