UK Stocks-Factors to watch on June 1

June 1 (Reuters) - Britain's FTSE 100 index is seen opening up 21 points at 7541, on Thursday, according to financial bookmakers. * POLL: Prime Minister Theresa May could lose control of parliament in Britain's June 8 election, according to a projection by polling company YouGov, raising the prospect of political turmoil just as formal Brexit talks begin. * BARCLAYS: Barclays will sell shares worth 1.5 billion pounds ($1.94 billion) in Barclays Africa Group, the bank said on Wedne

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