The Chancellor is being asked to investigate a decision to spend money earmarked to offset council tax rises in Wales on NHS bed blocking, it emerged today.
Monmouth MP Huw Edwards has written to Gordon Brown asking him if he is satisfied with the move by the Welsh Assembly Government.
Mr Brown announced the money for Wales in his pre-Budget report in November, but yesterday the Assembly Government said that part of the £22 million would be used to pay for more care places for the elderly.
Labour MP Mr Edwards today told BBC Radio Wales that he thought people "reasonably expected" to see the money go towards countering council tax rises, after hearing the Chancellor say that was what it was for.
"I have simply written to the Chancellor saying, 'Well, Gordon, is this really what you intended when you made this announcement in the pre-Budget statement?"' said Mr Edwards.
"I really think the Assembly must re-think it and allocate it for the purpose it was intended by the Chancellor."
Mr Edwards said that councillors in Monmouthshire had been hoping the extra money would have allowed them to set the council tax increase at 8.5%, but they were now looking at a rise of more than 10% instead.
"That is just too much on top of other high increases they have had in recent years," he said.
The MP also hit out at Monmouthshire's share of £500,000 allocated to fight deprivation. The local authority is set to receive just £10, a "derisory" amount for an area that, while not the worst off in Wales, did have pockets of deprivation, he said.
Russell Goodway, leader of Cardiff County Council and finance spokesman for the Welsh Local Government Association, branded the ring-fencing of the cash "ill thought out" and said it had caused outrage.
Bed blocking was not a universal problem throughout Wales, said Mr Goodway, and he disclosed that his own authority would be "creative" with its share of the money.
"We will be looking creatively at how we can make sure this money reaches the people it was intended to reach," he said.
Mr Goodway said he feared using the money to target social care would lead to added problems in the long-term.
"This is a one-off grant, and if we increase spending on social care for just one year it means that in one year's time we have to cut it back again or increase council tax to maintain the spending levels," he said.
Yesterday the Assembly's finance minister, Sue Essex, told BBC Wales: "This is about quality of life for elderly people across Wales. I don't think there's anything more pressing in Wales.
"This is money directly to local government to reduce the pressures that they have, which in turn will influence council tax rises to make sure they are reasonable."
She said that as she had already announced the money that would be made available to councils from the Assembly, the money from the Treasury would have to be awarded as a "special grant".
The Assembly Government is making £19.5 million available to tackle bed-blocking.