When tax comes back | Open thread

Millions of us could be in line for tax rebates. What would you do with the extra money?

HM Revenue and Customs, which administers the UK tax system, has admitted to errors that could result in more than 10 million people receiving rebates.

Though another 1.4 million are likely to receive the unwelcome news that they have actually paid less than they should, many of us will be celebrating an unexpected windfall. The average rebate will be around £418, and letters informing taxpayers that the government owes them money will start arriving from tomorrow.

If you're in line for a rebate, what will you do with it? Save, or splash out? And have you ever been lucky enough to receive one in the past?