As well as waiting six months for the bank statments for the application. Do bear in mind you both need to have a decent amount of savings/income for when you first come over.
No one can say how much the heating bill will go up, Cost of setting up a joint home and finding the foods you like will all hit the bank account trust me. The telephone bill will probably rocket both british callls and international. The wife was stuck at home at first so we joined blockbusters so she could hire dvds so she was not bored during the day.
The buying of an entire wardrobe of british weather clothes also cost just a little.
If we could have done it all again i would have saved even more money than i did to help my wife settle in.
Its hard waiting but just make sure you both have enough to support you both with out worrying about the money to much instead of enjoying being together.