UPDATE 1-UK Stocks-Factors to watch on May 23
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LONDON May 23 (Reuters) - Britain's FTSE 100 index is seen opening flat on Friday, while the June FTSE futures contract slipped 0.1 percent by 0620 GMT, with uncertainty over European elections seen pegging back markets. For more on the factors affecting European stocks, please click on
* The UK blue chip index ended flat on Thursday at 6,820.56 points.
* EU ELECTIONS:
Britain's anti-EU UKIP party has made strong gains in local elections, taking seats from both Prime Minister David Cameron's Conservatives and the opposition Labour party, according to early results on Friday.
* ASTRAZENECA : Continuación...