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* FTSE 100 down 0.2%, FTSE 250 adds 0.1%

May 30 (Reuters) - Britain's FTSE 100 opened near a one-month low on Thursday, mirroring weakness in Asian bourses as investors await key U.S. inflation data on Friday, while Anglo American added to losses.

The blue-chip FTSE 100 index slipped 0.2% by 7:12 GMT, extending its losing streak to the seventh straight session, while the mid-cap FTSE 250 edged 0.1% higher.

Investors are on guard as they await U.S. Federal Reserve's preferred inflation gauge, the personal consumption expenditures (PCE) price index data, on Friday for clues on the future path of monetary policy.

A speech by Bank of England Governor Andrew Bailey due later in the day will also be closely watched as the central bank will meet in three weeks to decide Britain's next monetary policy action.

Anglo American dropped 2.3% after BHP Group walked away from its $49 billion takeover pursuit. BHP's London-listed shares slipped 1.4%.

Severn Trent fell 2.7% as it traded without entitlement to its latest dividend payout.

Auto Trader Group soared 8.5% and was the top gainer on the FTSE 100 as the online car marketplace firm beat full-year profit estimates.

Boot maker Dr Martens led gains on the mid-cap index with a 5.0% jump after its new CFO lays out cost-savings plan. (Reporting by Pranav Kashyap in Bengaluru; Editing by Varun H K)