UPDATE 2-London's FTSE 100 ends on a flat note, Sirius Minerals plunges
* FTSE 100 flat, FTSE 250 down 0.1%* BP losses steam after Reuters' report* Sirius Minerals sinks to record low* Drop in banks countered by gains in consumer staples (Adds news items, analyst comment, updates to closing price)By Yadarisa ShabongSept...
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