Investement in subsidiary undertalkings are stated at costs less provision for impairment.
Cost represent the fair value of consideration paid, which in the case of the investment in the subsidiary is £1.
At each reporting date, the company reviews the carrying value of the investment for indications of impairment. If there is objective evidence that the investment is impaired, the carrying amount is written down to its recoverable amount, and the impairment loss is recognized in the income statement.
Where the reasons for previously recognised impairment losses no longer apply, those impairment losses are reversed through the income statement, up to the original cost of the investment.