- UK stocks opened substantially lower on Tuesday amid broader global market volatility inspired by concerns about rising US interest rates, slowing Chinese economic growth and geopolitical tensions between the West and Saudi Arabia.

At 0859, the benchmark FTSE 100 was down 52.92 points, or 0.8%, at 6.989.88.

Whitbread shed 2.4% as it booked a flat first-half profit and warned growth at its Premier Inn hotel chain would be constrained by investment spending and weak consumer confidence.

Broking house Plus500 rose 0.6%, after it said it expected trading in 2018 to be ahead of expectations, despite revenue falling in the third quarter due to regulatory changes.

Wealth managemer St. James's Place slumped 3.9% despite reporting an 11% rise in its funds under management underpinned by higher net inflows.

Builders' merchant and DIY retailer Travis Perkins gained 3.0%, as it grew third quarter revenue by 3.9% and said it was comfortable with market expectations for the full year.

Distribution and outsourcing company Bunzl said third-quarter revenue rose 7%, boosted by acquisitions and asset sales. Its shares shed 0.3%.

Retail property group Intu fell 1.0% after it cut its rental income guidance, blaming 'tenant failures' owing to a difficult UK trading environment.

Book merchant Bloomsbury Publishing gained 2.2% after it boosted first-half underlying profits, amid a strong performance from academic titles, and inked a new supply contract with the Institute of Chartered Accountants.

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