Two weeks ago DH received a letter from HMRC saying that he owed a tax payment of £3800 (this is in addition to the normal tax he has paid for the year)
He has just spoken on the phone to HMRC today (he has been out of the country for last week) and they have confirmed that this is the correct amount.
The reason for it is that DH was made redundant the year before last and his company basically messed up his redundancy pay when calculating the tax he owed.
HMRC are saying that we have to pay this amount immediately, that it can't be collected from his salary each month and nor will they agree to us paying this off in instalments? Not only that but the debt is now accruing interest 
DH tried to argue that this isn't an amount we can simply 'find' from thin air but they were having none of it. They said we would have to borrow money from friends or family or sell the family car, did we have any expensive sports equipment etc [cross] and they then advised him to get a loan or use a credit card!!!
We are not disputing the tax bill at all and nor are we refusing to pay it but given that the bill exists through no fault of our own - can they force us to pay it immediately?
I have no idea where we are going to find this money. DH is now thankfully back in work and don't get me wrong, we are doing 'ok' financially but his previous redundancy depleted all of our savings and we have no assets to sell. I'm bloody well not going to sell the family car, it's only worth about £400 anyway!!
Is there some way we can appeal this, or complain? Has anyone else been in this situation before?