Britain's FTSE 100 jumped to its highest level in five-and-a-half months as its multinational stocks got a boost from weaker sterling, while results-driven slumps in engineering firm Renishaw and trading platform IG dented the midcap index.
Financial stocks and housebuilders slipped after British Prime Minister Theresa May asked the European Union to delay Brexit and caused the FTSE 100 to snap a seven-day winning streak, while a slide in sterling pulled the mid-cap index lower.
Britain's FTSE 100 extended its winning streak to seven sessions on Tuesday as miners and oil majors boosted the index and Ocado climbed to an all-time high after posting higher first-quarter retail sales.
London's exporter-heavy FTSE 100 surged to a five-month high on the back of a drop in sterling after Britain's parliament speaker struck a fresh blow to Theresa May's EU divorce deal, while a rally in miners and oil stocks also lent support.
* Interserve slumps with administration imminent
(Recasts, adds company news items, updates with closing prices)
UK shares bagged another session of gains as financials cheered British lawmakers' rejection of a disruptive no-deal Brexit and oil majors rose on higher crude prices, but mid-cap retirement services specialist Just Group slumped on plans to raise funds.
Britain's main stock index ended roughly flat on Wednesday with gains in oil majors offset by a drop in tobacco stocks and as investors remained cautious before of a second pivotal Brexit vote of the week.
Britain's FTSE 100 gained on Tuesday after a fall in the pound triggered by the government's lawyer saying last-minute assurances won by Prime Minister Theresa May for her Brexit deal left the risk over the so-called Irish backstop "unchanged".
Britain's FTSE 100 kicked off a week of key Brexit votes in parliament on a positive note, with financial stocks shrugging off fears of a potentially disruptive no-deal divorce while mining companies found their support from higher zinc prices.
London's main bourse slipped on Friday, pulled lower by a fall in gambling firm GVC on news that its top executives cut stakes and a decline in oil majors after Norway's sovereign wealth fund said it would sell its upstream oil and gas holdings.