National Australia Bank (NAB) has formally announced plans to proceed with the flotation of its loss-making UK banking operations Clydesdale and Yorkshire banks.

Clydesdale and Yorkshire, acquired by NAB in 1987 and 1990 respectively, have been adversely affecting NAB’s profitability for years.

The Australian banking group said that it would demerge 75% of the UK subsidiary to shareholders and float the remaining 25% per cent in London in February 2016.

"The proposed demerger and IPO remain subject to a range of matters, including various court and regulatory approvals and NAB shareholder approval," the Australian lender said in a statement.

The latest move forms part of NAB’s strategy to focus on more profitable core businesses. Under this strategy, the bank has earlier floated its regional US unit, Great Western Bancorp.

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