No the bank won't allow you to do this, you both are jointly and severally liable. As you can't pay you can go into default, it will take the bank at least 2 years to get the house off you, there is a code of conduct on this. They will then try to get you and/or your husband to pay it back via installment order. Yes you will get a bad credit rating but in time that too will be gone and you can start again.
You should try Mabs, or do the money makeover on here.
There is no point your thinking along the lines of 'I'm willing' to pay half the negative equity as a bank is not going to be seeing it like this.
Also you may need to go after your husband for maintenance unless he has no income.