Heightened concerns over the course of Brexit and mounting pressure on Prime Minister Theresa May to step down weighed heavily on Britain's mid-cap index and domestically-focused blue-chip stocks on Thursday.
Brexit sensitive housebuilders and airlines slid on Wednesday as rumours circulated that ministers could oust Theresa May after her latest EU exit plan failed to win support, while exporters lifted the FTSE 100 as the pound weakened.
London's main share index dipped on Friday, as Just Eat slumped after Amazon backed rival food delivery firm Deliveroo in a funding round, but losses were limited as exporters were helped by a slide in sterling amid renewed Brexit jitters.
Rallying banks and mining stocks lifted Britain's FTSE 100 on Thursday, but weak earnings hit luxury brand Burberry and Thomas Cook was floored by a profit warning.
British shares surged on Tuesday as investors grew optimistic about a U.S.-China trade deal after U.S. President Donald Trump vowed it would happen soon, while demand for vegan sausage rolls propelled baker Greggs to a record high.
London's main stock index closed lower on Friday, capping its worst week in more than five months, with exporters following the U.S. dollar lower as hopes for a resolution to the U.S.-China trade dispute stoked appetite for riskier assets.
Britain's main index was dragged back to its six-week low on Thursday as markets remained wary of an imminent tariff hike as trade talks between the United States and China resumed in Washington.
Britain's FTSE 100 ended higher on Wednesday as investors welcomed indications from Washington that it and Beijing could be closer to a trade deal, though the mood remained wary and dull earnings updates kept a lid on gains.
Britain's main stock index tumbled to a near six-week low on Tuesday as investors returned from a long weekend to a threat of more U.S. tariffs on China that triggered a selloff led by oil majors and banks.
Britain's main index gained ground on Friday as a profit beat buoyed HSBC and miners recouped recent losses ahead of Chinese-U.S. trade talks next week, while upbeat U.S. jobs data kept investors happy.