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* FTSE 100 up 0.4%, FTSE 250 up 0.1%
* Data provider Experian tops main index
* Discounter B&M weighs on midcap
Nov 12 (Reuters) - UK blue-chip stocks edged higher on Tuesday, attempting to recover after being hit by escalating Hong Kong tensions and downbeat trade rhetoric in the previous session, while credit data firm Experian boosted the main board after it upgraded its revenue target.
The FTSE 100 was up 0.4% as at 0805 GMT, and the midcap index rose 0.1%, a day after Brexit Party leader Nigel Farage gave Tories a massive boost by saying he would not contest in the Dec. 12 election.
Among blue-chips, Experian climbed nearly 3% after it upgraded organic revenue growth target on the back of strong business in its main North American market, while industrial software company AVEVA added 2.7% after upbeat results.
Discounter B&M European Value Retail weighed on the midcap index with a 10% drop, after it said it was undertaking a review of its German unit to decide the future of the poorly performing business. (Reporting by Shashwat Awasthi and Muvija M in Bengaluru; editing by Uttaresh.V)