The three biggest firms - Fitch, Moody's and S&P Global - all have a negative outlook on their respective ratings for Britain.
The move is part of a set of measures adopted by the European Union after last year's Panama Papers and other revelations of widespread tax avoidance by wealthy individuals and big firms
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The governor of the Bank of Portugal has called the measures that the European Commission has taken.
Greece's economy expanded in the first three months of 2017, upwardly revising a previous flash estimate in May that showed a 0.1 percent quarterly contraction.