Britain’s FTSE 100 index hit a better-than-three-year high on Friday, boosted by miners and power stocks. At the same time, slower-than-expected U.S. jobs change fuelled hopes that the world’s largest economy may be less aggressive in raising interest rates.The export-oriented FTSE 100 (.FTSE) locked up 0.9%, while the domestically concentrated FTSE 250 (.FTMC) ended 0.2% higher by 1645 GMT. “The...