This means Aitken will have served only eight months of his 18-month sentence for perjury and perverting the course of justice.
His release will once again thrust into the spotlight the efforts of accountancy firm Baker Tilly, acting on behalf of Aitken's creditors, to secure repayment of his £2.2m debts.
The firm has recently instructed counsel to start proceedings in order to place a claim over his government pension. A second previously undisclosed pension, which is a legacy of the financial services company he helped set up in 1981, could also become a target.
'This is a substantial sum of money, but he will not give it up without a fight,' according to a source.
A Home Office spokesman confirmed Aitken - who will also be allowed home for five days over christmas - would be eligible for parole in early January but warned that unforeseen events could happen in the meantime to jeopardise his release. 'We never comment on individual release dates,' the spokesman said.
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