I would have thought your mortgage would be sold to another broker by the liquidators/administrators.
Look at the largest mortgage holders in the US, they were taken on my the government. A bit like being in Soviet Russia - the government effectivley owns more of your hose than you - bummer.
Your savings/pension would most probably vannish, or you would get x% as you are technically a creditor.
It is not the UK commercial banks that have had such a high exposure to the junk bonds that the US investment houses have taken on. Investment Banker is slang for a well used word - there is a valid reason for this.
Too many bet wrong and now they are crying that they have lost it all. Don't forget that they made tonnes of money when it was good. There was one CEO who was largely responsible for investing in the sub primes, he left in 07 with $161,000.000 and then the company went pop/was sold.
This is a huge adjustment verging on a global scale. House prices will revert back to a reasonable price and those that can't afford a house will have to rent. No more silly lending.