The UK and the EU - 40 years on
In 1973, the decision to join the then EEC provoked bitter arguments and divisions within both main UK political parties.
Forty years on, and the arguments over the UK's involvement with the EU continue.
To mark the anniversary, the European Parliament's office in London is holding a series of debates looking back at the UK's role in the EU, and looking forward to what the future might hold.
The first debate consisted of two panel discussions - one looking back and one looking forward.
Appearing in the first panel were Bill Cash MP, chair of the House of Commons European Scrutiny Committee; Dr Oliver Daddow, from the University of Leicester; Sir Stephen Wall, the former head of the UK Representation in Brussels; and Professor Dame Helen Wallace, from the European Institute of the London School of Economics.
The second panel featured the leader of British Conservatives in the European Parliament, Richard Ashworth MEP; Labour's Mary Honeyball MEP; Conservative MP and member of the 'Fresh Start' group, Andrea Leadsom MP; and Liberal Democrat Foreign Office minister Lord Wallace of Saltaire.
We apologise for the brief break in coverage, this is due to technical reasons outside of our control.