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* FTSE 100 down 0.2%, FTSE 250 down 0.5%
* Markets eye details of Brexit negotiations
* Rio Tinto, Barratt among biggest blue-chip fallers
Oct 16 (Reuters) - London’s domestically-focussed mid-cap index shed almost half of the previous session’s more than 1% gain in early trade on Wednesday, with investors awaiting confirmation that a Brexit deal is really in the offing.
The FTSE 250, which has rallied more than 3% since last week on hopes that Britain could clinch a timely divorce deal, shed 0.5%, with traders eyeing a crunch summit this week after last-ditch talks between London and the European Union.
The blue-chip FTSE 100 was also marginally lower, with miner Rio Tinto and housebuilder Barratt slipping respectively 2% and 2.7% on signs of weakening future revenue. (Reporting by Shashwat Awasthi in Bengaluru; editing by Patrick Graham)