Summary of significant accounting policies and key accounting estimatesThe principal accounting policies applied in the preparation of these financial statements are set out below. These policies have been consistently applied to all the years presented, unless otherwise stated.Statement of complianceThese abridged financial statements were prepared in accordance with Financial Reporting Standard 102 'The Financial Reporting Standard applicable in the UK and Republic of Ireland'.Basis of preparationThese abridged financial statements have been prepared using the historical cost convention except that as disclosed in the accounting policies certain items are shown at fair value.Revenue recognitionTurnover comprises the fair value of the consideration received or receivable for the sale of goods and provision of services in the ordinary course of the company’s activities. Turnover is shown net of sales/value added tax, returns, rebates and discounts. The company recognises revenue when: The amount of revenue can be reliably measured; it is probable that future economic benefits will flow to the entity; and specific criteria have been met for each of the company's activities.TaxThe tax expense for the period comprises tax. Tax is recognised in profit or loss, except that a change attributable to an item of income or expense recognised as other comprehensive income is also recognised directly in other comprehensive income.The current income tax charge is calculated on the basis of tax rates and laws that have been enacted or substantively enacted by the reporting date in the countries where the company operates and generates taxable income.Business combinationsBusiness combinations are accounted for using the purchase method. The consideration for each acquisition is measured at the aggregate of the fair values at acquisition date of assets given, liabilities incurred or assumed, and equity instruments issued by the group in exchange for control of the acquired, plus any costs directly attributable to the business combination. When a business combination agreement provides for an adjustment to the cost of the combination contingent on future events, the group includes the estimated amount of that adjustment in the cost of the combination at the acquisition date if the adjustment is probable and can be measured reliably.Negative goodwillNegative goodwill arising on an acquisition is recognised on the face of the balance sheet on the acquisition date and subsequently the excess up to the fair value of non-monetary assets acquired is recognised in profit or loss in the periods in which the non-monetary assets are recovered.InvestmentsInvestments in equity shares which are publicly traded or where the fair value can be measured reliably are initially measured at fair value, with changes in fair value recognised in profit or loss. Investments in equity shares which are not publicly traded and where fair value cannot be measured reliably are measured at cost less impairment.Interest income on debt securities, where applicable, is recognised in income using the effective interest method. Dividends on equity securities are recognised in income when receivable.Cash and cash equivalentsCash and cash equivalents comprise cash on hand and call deposits, and other short-term highly liquid investments that are readily convertible to a known amount of cash and are subject to an insignificant risk of change in value.Trade debtorsTrade debtors are amounts due from customers for merchandise sold or services performed in the ordinary course of business. Trade debtors are recognised initially at the transaction price. They are subsequently measured at amortised cost using the effective interest method, less provision for impairment. A provision for the impairment of trade debtors is established when there is objective evidence that the company will not be able to collect all amounts due according to the original terms of the receivables.Trade creditorsTrade creditors are obligations to pay for goods or services that have been acquired in the ordinary course of business from suppliers. Accounts payable are classified as current liabilities if the company does not have an unconditional right, at the end of the reporting period, to defer settlement of the creditor for at least twelve months after the reporting date. If there is an unconditional right to defer settlement for at least twelve months after the reporting date, they are presented as non-current liabilities. Trade creditors are recognised initially at the transaction price and subsequently measured at amortised cost using the effective interest method.Share capitalOrdinary shares are classified as equity. Equity instruments are measured at the fair value of the cash or other resources received or receivable, net of the direct costs of issuing the equity instruments. If payment is deferred and the time value of money is material, the initial measurement is on a present value basis.