Lord Condon said when he took over as Commissioner of the Metropolitan Police he was warned that the force did have "a small but significant number of officers whose behaviour was totally unacceptable" and this went from "minor disciplinary right the way through to serious disciplinary".
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Tory Eurosceptic Jacob Rees-Mogg played down the significance of the deal struck by the Government to win over pro-EU rebels.
The Tanaiste issued the warning to the UK ahead of a visit to Dublin by European Commission President Jean-Claude Juncker.
Around 9,500 people gathered at the neolithic World Heritage Site to attend the overnight celebration of the longest day of the year.