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* FTSE 100 flat, FTSE 250 adds 0.2%

Oct 24 (Reuters) - The UK's FTSE was flat on Monday as gains in mining stocks tracking metal prices higher offset the drag from shares of Barclays following lacklustre quarterly results.

The commodity-focused FTSE 100 was unchanged while the mid-cap FTSE 250 rose 0.2%.

British lender Barclays lost 6.1% after the third-quarter profit dipped slightly from a year ago on sliding revenues in its investment bank.

The banking index dropped 1.5%, leading declines.

Shares of Bunzl Plc shed 4.6% after the business supplies distributor trimmed its full-year revenue forecast, weighed down by lower product prices. Limiting declines, industrial metal miners added 1.7% on a rise in the prices of most metals.

Precious metal miners also climbed 0.3% following a pullback in U.S. Treasury yields, while demand for the safe-haven product also rose amid growing tensions in the Middle East.

Meanwhile, data showed Britain's unemployment rate held steady at 4.2% in the three months to August. However, the big picture remained of a softening labour market with the number of people in jobs falling again, cementing hopes of a rate pause by the BoE in its upcoming policy meeting.

(Reporting by Khushi Singh; Editing by Janane Venkatraman)