I've just seen this on iplayer
I really really hope she doesn't marry him.
My guess is that she has hit 30 and wants babies.
She knew he always fancied her since his teens. He now has a decent job. Although she doesn't know how much he earns

She doesn't want to waste any more time looking for Mr Right and knows he can give her the family she wants.
The catch is in exchange for the babies she wants he wants marriage, a name change and a subservient housewife.
I get the impression he has a 'what's mine is mine' attitude to money and won't share finances after the 'I do'.
All that 'waiting until she can afford it to buy a table'!! She gave up het career for him- what does he expect?
They'll get married, have their kids but she will be a single mum, like her mum in a decades time.