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* FTSE 100 up 0.8%, FTSE 250 rises 0.5%
* Technical glitch causes more than 1-1/2 hour delay
* All sectors in the black in early dealings
Aug 16 (Reuters) - Britain’s stock market indexes jumped after a delayed open following the London Stock Exchange’s longest outage in eight years on Friday, boosted by broad gains across sectors.
The main index advanced 0.8% and the mid-cap FTSE 250 rose 0.5% by 0847 GMT, with all sectors on the indexes in the black when trading began after an almost two-hour delay.
Both indexes were rebounding after two straight sessions of steep losses, which were triggered by fears of a looming recession and worries that the U.S.-China trade war may escalate further. (Reporting by Muvija M and Shashwat Awasthi in Bengaluru; Editing by Bernard Orr)