I've been in this position. This is what you both need to do based on what you have written so far.
Stand in front of the mirror and say "this week we will file for bankruptcy".
There is no stigma associated with this any more. You file some paperwork with the court, and from that moment, your problems go away. The court will take a look at both your incomes and, i suspect, probably conclude that you cannot reasonably afford to pay any of these debts back. They have a calculator that they use to calculate what you will be allowed to have to live on and it is actually quite generous. If i read correctly, you don't own your house.
But you have to steal yourself for some minor inconveniences around not having a bank account, etc.
In a year's time, you will be discharged and you can go back to normal - but steer away from credit which will be punishingly expensive.
In 6 years time, you'll be able to get credit with the best of them.
Why do i come to this conclusion? You mentioned owing £200,000. That means you need to be paying back £35,000 a year to be out of debt in 6 years. You clearly cannot do that, so why try.
Your husband is clearly a principled and honourable man. Exactly the kind of man who will end up with cancer or a heart attack because he cannot face not being able to meet his commitments.
Life is more important. Bite the bullet, file for bankruptcy and you'll look back and wish you did it years ago.