Set up by HM Treasury and the Bank of England, the CCFF will provide the housebuilder with a short-term loan of £300mln.
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In a statement, the FTSE 250-listed company added that it is negotiating with its lenders for an extra £100mln headroom under an existing debt facility.
The firm said it is engaging in cost-cutting measures, with 80% of staff being furloughed, and senior management taking a 20% salary cut.
Shares advanced 9% to 440.8p on Thursday morning.