Mumsnet is always good for a quick sample of the state of the market.
One interesting post:
http://www.mumsnet.com/Talk/property/2121952-Applying-for-mortgage-DH-too-old-for-25-year-mortgage
On a side note, you can lots of fun with the new HSBC mortgage calculators.
I was putting in real life examples of couples I know - mid 30s - salaries, debt.
The max mortgage the average person I know can get is 60K.