Union in EU threat over PM's plan to curtail worker rights

GMB union writes to all 27 EU states saying any successful negotiation to weaken employment rights would lead to a push from members for a no vote in the referendum
Some trade unions could push for Britain to quit the EU if member states allow David Cameron to water down worker rights as part of his renegotiation, the GMB union has warned in letters to every European leader.The GMB, which has more than 631,000 members and is one of Labour’s biggest donors, wrote to all 27 EU member states to s