Oil giants lift FTSE 100, trade uncertainty lingers

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* FTSE 100 up 0.1 pct; FTSE 250 down 0.5 pct

* Oil majors nudge main index up

* Centrica rises after Q1 trading update

* Metro Bank skids to life-low again

May 13 (Reuters) - Britain's FTSE 100 edged up on Monday, led by oil heavyweights and as investors flocked to defensive stocks on concern over the stand-off in Sino-U.S. trade negotiations.

The FTSE 100 was up 0.1% by 0720 GMT while the FTSE 250 was down 0.5%.

Interest in stocks considered safe bets during uncertain times was high as trade negotiations between Washington and Beijing seemed to be at a deadlock.

Oil majors Shell and BP gained as oil prices rose on concerns about supply disruptions in the Middle East.

British Gas owner Centrica added 2% after it maintained its annual operating cash flow and net debt forecast despite a challenging trading environment.

Metro Bank, which has lost more than two-thirds of its value this year, slipped 7.8% to hit another all-time low on the mid-cap index.

It said on Friday its plan to raise equity was well advanced, while a Financial Times report on Sunday said the bank was looking to sell loans that were hit by an accounting error. (Reporting by Shashwat Awasthi in Bengaluru; editing by Emelia Sithole-Matarise)