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Critical judgements in applying the Group's accounting policies

In the process of applying the Group's accounting policies, which are described in note 2, management has made the following judgements that have the most significant effect on the amounts recognised in the financial statements (apart from those involving estimations, which are dealt with below).

Capitalised new product development expenditure

It is the Group's policy, where the relevant criteria of IAS 38 "Intangible Assets" are met, to capitalise new product development expenditure and to amortise this expenditure over the estimated economic life of the asset (product). Judgement is required when assessing the technical and commercial feasibility of new product development projects including whether regulatory approval will ultimately be achieved.

Capitalised software expenditure

The Group has historically capitalised software projects and developments. Expenditure on a bespoke web based system, designed to facilitate online ordering of its products and services, is currently capitalised in the Group's financial statements as the Directors have adjudged it to meet the relevant criteria.

The rate of depreciation on capitalised software is set so as to reflect the pattern of usage and the level of pace of change within the global information technology market.

Key sources of estimation uncertainty

Impairment of non-current assets

Determining whether a non-current asset is impaired requires an estimation of the "value in use" and/or the "fair value less costs to sell" of the cash-generating units ("CGUs") to which the non-current asset has been allocated. The value in use calculation requires an estimate of the future cash flows expected to arise from the CGU and a suitable discount rate in order to calculate present value. The key assumptions for these value in use calculations are those regarding discount rates, growth rates and expected changes to selling prices and direct costs. The Directors estimate discount rates using pre-tax rates that reflect current market assessments of the time value of money and the risks specific to the individual CGU. In the current year the Directors estimated the applicable rate to be 11.1% (2014: 10.2%). The Directors' sensitivity analysis indicates significant headroom to the carrying value of the CGU when taking into account a reasonably possible change in any one of the key assumptions used in the value in use calculations.

The Group prepares cash flow forecasts derived from the most recent financial budgets and projections approved by management for the next five years, thereafter assuming an estimated growth rate of 2% (2014: 2%). The growth rates for the five year period are based on current performance of the existing product portfolio and the estimated contribution from the Group's new product development pipeline. The Directors believe that the long-term growth rate does not exceed the average long-term growth rate for the UK economy.

Impairment of slow-moving and obsolete inventory

The Group performs regular stock holding reviews, in conjunction with sales and market information, to help determine any slow-moving or obsolete lines. Where identified, adequate provision is made in the financial statements for writing down or writing off the value of such lines in order to reflect the realisable value of its stock.