FTSE 100 eases after four sessions of gains

(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 <.FTSE> was a tad bit lower by 0708 GMT, while an index of midcaps <.FTMC> 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 <WPP.L>, the world's biggest ad firm, and Barclays <BARC.L> 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)