Dig out your mortgage info if you dont know off the top of your head.
Check for the following;
LTV
Date your initial fixed term expires
How much you owe (sometimes you can log in online and see this figure, if youre not sure, you can sometimes get a rough figure from your credit report, although its often 1 or 2 months out if date).
Sit and work your figures out.
Do you think 4.5times your average annual salary will cover the remaining balance of your mortgage?
When does your initial fixed deal expire? (If you have one)
Then speak to the bank. Youll have to pass affordability checks again, as youll effectively be reapplying for the mortgage on your own.
If the bank says no, speak to an independant mortgage advisor so will advise you, off the top of their head probably, what your options are with other banks if yours is saying no.
Youll be fine. But no need to let on yet to that nasty man that youre planning, dont let him get ahead of you. Your cunning here will be empowering.
Also...get on to the child maintenance calculator and work out, using his salary, how much he will owe you for the children per month. As youll need to add this to your income for the bank.
Keep coming back for more help, we are here to support you. More will be along with even better advice, im sure.