Prime Minister Tony Blair is expected to announce on Wednesday a timetable for the withdrawal of Britain's troops from Iraq, with 1,500 to return home within weeks.
Blair is due to make an announcement in the House of Commons in which he is expected to clarify the details, the BBC reported.
He is expected to say hundreds of troops will return from Iraq's southern city Basra within weeks with more to follow later.
Some 7,000 UK troops are currently serving in Iraq and about 1,500 are expected to return within weeks, it said.
By Christmas a total of 3,000 troops were expected to have returned to the UK from Iraq.
However, reports that all troops will have returned home by the end of 2008 was not a fair representation of what is true at the moment, the report said, quoting unidentified government sources.
The pullout was slightly slower than it was expected and if conditions worsen this process could still slow up, it said.