Britain's FTSE climbs as banks and oil companies rise, M&S slumps
* Progress on Greek debt relief buoys European markets * FTSE near 1-month high, up 0.7 pct * M&S slumps after warning of short-term profit hit (Adds detail and updates prices) By Kit Rees and Sudip Kar-Gupta LONDON, May 25 (Reuters) - Britain's top shares index climbed
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