If you are referring to the UK then the home is as much the wife's as it is the husband's. She is entitled to half of the equity.
The pension is another asset to be divided, as is life insurance.
http://www.theanswerbank.co.uk/Law/Civil/Quest ion594578.html#top
Alimony is 'maintenance'. If she has been financially supported during the marriage - perhaps because she was raising the family and supporting his career - then she is also entitled to continue to be maintained. It is unrealistic to expect a middle aged woman who has never worked outside the home, or hasn't for many years, to be able to support herself in employment.
Also, if she hasn't had a career of her own, she will have been relying on her husband's pension to provide in her old age.
This is a good article re the basics of maintenance and other provisions made in divorce:
http://www.terry.co.uk/matcaus1.html
'Fault' doesn't come in to the equation at all - one party will not be awarded less because they have had an affair or otherwise behaved badly, causing the marriage to break down.
At present, pre-nuptial agreements are not legally enforceable in the UK although it is highly unlikely such a contract was made 30 years ago.