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* FTSE 100 marginally down, FTSE 250 down 0.1%
* Polymer maker Synthomer tanks after profit alert
* Barclays, WPP gain after Q3 updates
Oct 25 (Reuters) - UK blue-chips eased from a near one-month high on Friday, but was still headed for its best weekly performance in nine months as a tug of war between the parliament and its leader over Brexit knocked the pound and boosted exporter stocks.
The FTSE 100 was a tad bit lower by 0708 GMT, while an index of midcaps dipped 0.1%, with losses led by a 14% plunge in Synthomer shares after the polymer maker issued a profit warning.
Blue-chips received support from WPP, the world’s biggest ad firm, and Barclays that added 5% and 2%, respectively, after they updated the markets on their third-quarter performances. (Reporting by Muvija M and Shashwat Awasthi in Bengaluru; Editing by Arun Koyyur)