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UK stocks opened lower on Wednesday as energy companies were dragged down by recent oil-price weakness.
At 0859, the benchmark FTSE 100 index was down 12.86 points, or 0.2%, at 7.564.34.
BP and Shell fell 1.9% and 0.8%, respectively, while Premier Oil shed 3.2%, even as it boosted first-half production and lowered its cost guidance.
Mining giant BHP gained 0.4%, despite it reporting a 1% fall in fourth-quarter iron ore production owing to a cyclone in Australia.
The fall was nevertheless in line with the company's revised guidance and it also exceeded its guidance for petroleum output.
Fellow miner Fresnillo shed 2.2% as it cut its full-year production guidance on the back of lower-than-expected ore grades and construction delays.
TalkTalk Telecom added 3.8% after the addition of new broadband customers helped it grow headline revenue in the first quarter.
Consumer goods group UP Global Sourcing, which trades as Ultimate Products, jumped 13% as it upgraded its annual profit guidance owing to better-than-expected sales in the second half.
Premier Foods added 1.2% after it reported higher revenue in the first quarter, underpinned by sales of its Ambrosia and Sharwood's brands.
Water utility Severn Trent declined 0.5%, despite announcing that it had made a 'good' start to the new financial year and expected to deliver a full-year result in line with prior guidance.
Internet of Things investor Telit Communications fell 1.5% on guiding for a fall in first-half revenue owing to the sale of its automotive business.