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* FTSE 100 down 0.4%, FTSE 250 flat
* Galliford climbs after deal talks
* Strong pound drags exporter stocks
Sept 10 (Reuters) - UK blue-chip shares slipped on Tuesday, as a second set of disappointing data from China this week cemented fears of a slowdown in global economic growth, while gains in the pound amid fading no-deal Brexit worries hit multinational stocks.
The FTSE 100 index dipped 0.4%, having suffered its worst day this month in the last session, with equipment rental giant Ashtead falling 3% after in-line results.
The more domestically-focussed index of midcaps was flat by 0705 GMT, supported by a 22% jump in Galliford Try after the construction company said it had restarted preliminary talks to sell its residential units to housebuilder Bovis Homes.
Sterling was seen close to a six-week high it hit on Monday after parliament passed a bill blocking a no-deal Brexit, weighing on British American Tobacco and Diageo as strength in the local currency meant the value of their U.S. earnings would be lower. (Reporting by Muvija M in Bengaluru; Editing by Bernard Orr)