As many public and private sector union members face the threat of redundancy, others have the uncertainty of changes to terms and conditions, including cuts in pay and benefits.
David Cameron, in his Europe speech in January this year, may have pledged to renegotiate parts of the UK's relations with Europe, but he was vague about the powers the UK should take back.
Although many of the rights enjoyed in the UK come from Europe, most are home grown and came about as a result of earlier struggles and injustices.