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The FTSE 100 was down 0.26% at 7,162.45 by midday following the release of a lower than expected UK inflation number and as the country's house prices hit yet another record high.
The UK's consumer price index was up 2% in July, missing expectations of a 2.3% increase.
House builder Persimmon shed 0.3% to £28.60, even as it posted a 64% surge in first-half profit to £480 million after an easing of Covid-19 restrictions allowed it to complete more homes.
Persimmon declared first-half dividends of 235p per share, up from 110p year-on-year, and reaffirmed guidance for around 10% growth in home completions this year.
Infrastructure group Balfour Beatty fell 3.3% to 308.6p despite returning to profitability in the first half as it continued to recover from the pandemic.
Balfour Beatty declared an interim dividend of 3p per share, up 43% on the corresponding pre-pandemic dividend for 2019. It also raised margin targets for its support business to 6-8%.
Resources company Hochschild Mining rose 2.2% to 154.78p, having reported improved first-half profit as a jump in production amid rising commodity prices bolstered revenue.
Hochschild Mining said it expected to announce an interim dividend by the end of the month.
Payments group Network International climbed 0.6% to 354.6p as it swung to a first-half profit after it processed more transactions and hosted a higher number of cards.
German business park investor Sirius Real Estate firmed 1.7% to 123.9p after it notarised or completed the acquisition of four business parks and one land parcel for a combined €84.8 million.
Industrial flow equipment manufacturer Rotork gained 1.0% to 338.4p as it launched a £50 million share buyback.
Diagnostics group Novacyt jumped 11% to 335.94p on announcing that its first-half revenue had jumped 50%, underpinned by demand for its Covid-19 tests.
Novacyt reiterated full-year revenue guidance of €100 million, excluding sales from the UK's Department of Health and Social Care.
Oil company SDX Energy sank 14% to 12.5p after an exploration well in Egypt failed to find gas.