* FTSE 100 up 1 pct, at 5-month high
* FTSE 250 about flat
* Worldpay's London shares jump after buyout deal
* Financial stocks up on M&A
* Hunting up on rating upgrade (Adds news items, updates share moves)
By Muvija M and Shashwat Awasthi
March 18 (Reuters) - 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.
The FTSE 100 .FTSE added 1 percent - its biggest one-day rise since early February - to mark a sixth straight session of gains while midcaps ended roughly flat as a weaker pound weighed.
Parliamentary speaker John Bercow said any proposal British Prime Minister Theresa May puts to lawmakers must be substantially different to the ones previously rejected by them. government now faces the total ruin of its strategy, as a third ‘Meaningful Vote' (a term that becomes less meaningful with each vote) is ruled out unless changes are made," said Chris Beauchamp, analyst at IG.
Bercow's comments aggravated Brexit jitters as May has just a few days to push her divorce deal through if she wants to go to an EU summit on Thursday with something to offer them in return for more time.
Sterling slipped in response to the chaotic turn of events, although that boded well for FTSE 100, which books a big chunk of its earnings in the greenback.
On the main index, Shell RDSa.L and BP BP.L were among the top boosts on higher crude prices, while miners .FTNMX1770 jumped 2.4 percent on their best day in nearly two months, tracking gains in iron ore futures on supply concerns after Vale's VALE3.SA output cuts.
Both UK indexes enjoyed a strong run last week on hopes that a potentially disruptive no-deal Brexit would be averted, but the more domestically-focussed midcaps ended their winning streak on Monday.
News-related moves were scant but buyout bids boosted banks.
In the broader financial sector, London-listed shares in payment processor Worldpay WPYa.L also surged 9.3 percent after the UK-based group agreed to be bought over by U.S. fintech group Fidelity National Information Services FIS.N for about $35 billion.
Bank stocks are also on a six-day winning streak with a no-deal Brexit on March 29 seemingly off the table.
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