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* FTSE 100 down 0.7%, FTSE 250 down 0.5%
* Kingfisher slips after Q3 report
* Mitchells & Butlers outshines mid-caps
Nov 20 (Reuters) - London's FTSE 100 slipped into the red on Wednesday as shares in retailer Kingfisher slumped 8% after its quarterly sales disappointed, and as lack of clarity on the Sino-U.S. trade front remained.
After three straight days of gains, the main index fell 0.7%, as trade uncertainty weighed on Asia-exposed financial stocks like HSBC. The FTSE 250 gave up 0.5%, with losses in all but one sectors.
Outperforming the mid-cap index was pub operator Mitchells & Butlers, which jumped 8% after reporting higher annual adjusted operating profit. (Reporting by Yadarisa Shabong in Bengaluru; editing by Uttaresh.V)