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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 .FTMC , 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 .FTSE was also marginally lower,
with miner Rio Tinto RIO.L and housebuilder Barratt BDEV.L
slipping respectively 2% and 2.7% on signs of weakening future
revenue.