"You recently took a full year mat leave" - had no choice, we didn't have any other childcare as my parents very generously do some of it for us and they weren't up to looking after a small baby. Nursery costs for both DCs would've meant there was no point in DH working. I guess your reply to that would be that we shouldn't have had another baby, and I guess you're probably right but it's too late now.
We used the credit cards to live off, not to maintain a "lifestyle." They were used to pay for food and fuel primarily. The debt goes back further than that too obviously (we didn't run up £40K in one year!) Amongst other things, it has paid for two second-hand cars (one of which has now been replaced with the new car), vital home improvements and my first maternity leave too.
Re the new car: I said in my OP why we didn't buy a second-hand car. We couldn't get a loan (more unsecured debt) and we had no lump sum to pay for something outright. Our old car was completely knackered. We really honestly do need two cars as we work in opposite directions at different times of day, there are no lift-share options with colleagues and there are no buses. I have obviously explored these possibilities but we live in very rural Cornwall and that is life here. The new car is the smallest, cheapest 4 door that we could find. It has a 6 year warrantee, 3 years MOT free, no car tax and does 50+ mpg. Getting the new car was NOT something we did lightly, we really could not think of another option. If any of you can then I would be really keen to hear it. If we lose the car then one of us will lose our job and income. This is one reason why an IVA is more sensible for us than bankruptcy as it prioritises secured debt including cars that are required for work.
We are also not declaring bankruptcy because we don't want to risk losing the house. But we are prepared to make life-changing decisions. Yes similar has happened to us before but there were entirely different circumstances surrounding that (DH's father had just died, he was horribly depressed, he went a bit bonkers with money and also gave his mum loads to help her out). That was for much much less money, which we actually paid off, almost in full, in less than a year. I don't put any of this down to bad luck, and I am under no illusions about the fact that we entirely deserve to be in the shit that we are in.
Money Saving Expert says that CCCS recommended IVAs to only 3% of people in 2006, that's one company and it's six years ago. The Debtwizard link suggests that Debtwizard themselves get a fee from Payplan if you go to them and they put you onto Payplan. We went direct to Payplan. However Payplan (or any other insolvency practitioner) does get fees of about £7500 for sorting an IVA. I didn't know this so thanks for telling me, Payplan didn't make this clear at all. I have signed the paperwork now though and we've started the process. I'm going to talk to them in the morning to see if a DMP is a better option.
And finally I am not living a fantasy life. My new car is not a lifestyle choice and owning it is not about enjoying life, it is about getting to work which is all I will ever do in it as the agreement restricts the mileage I can do without losing money. I am not a materialistic person and I don't care about cars, or Christmas presents for that matter but thanks for the Christmas suggestions. As some of you suggest, we have plenty of stuff in the house and the DCs will not care about having very cheap presents.