On the anniversary of the day Britain signed Article 50, three of Britain's largest regional publishers have launched the biggest survey of British attitudes to Brexit since the referendum, in partnership with Google Surveys. Johnston Press, Reach (formerly Trinity Mirror) and Newsquest are running a joint venture to look at attitudes to Brexit and whether public opinion has changed since Prime Minister Theresa May triggered Article 50 of the Lisbon Treaty, enabling Britain’s official exit from the European Union. Article 50 was triggered on 29 March 2017 and initiated the long and complex process of the UK’s exit from the European Union. Led by UK Brexit Secretary David Davis and EU chief negotiator Michel Barnier, negotiations continue with no formal deal yet being agreed. Britain and the EU have a number of key areas to finalise before a deal can be made. With immigration, business, security and defence, health, education, science, environment, fishing and farming all being debated at the negotiating table, as well as on the streets of Britain. Whatever the outcome of negotiations the UK is set to leave the EU on Friday 29 March 2019 after 45 years of membership. Britain’s biggest Brexit survey will be made available across hundreds of sites, including this one from today (29 March) to gather the largest collection of public opinion since the referendum vote. The survey will look at attitudes to Brexit one year on and ask if readers are happy with the status of Brexit negotiations and would they vote the same as before knowing what they know now? Look out for Britain’s biggest Brexit survey on our stories from today.