Full access to Europe’s single market is vital for UK businesses and jobs, the main group campaigning for Britain to remain in the EU is set to say.
The chair of Britain Stronger in Europe, Stuart Rose, will present his arguments at an event later.
However, “out” campaigners are expected to claim support from new research by the independent think tank Civitas.
It says membership of the single market has not had a significant impact on export growth.
The prime minister, who wants the UK to stay within a “reformed” European Union, is pushing to renegotiate Britain’s terms of membership ahead of an in/out referendum which must be held by the end of 2017.
If agreement with other EU leaders is reached next month, a vote could potentially be held as early as June.
‘Fantasy’ thinking
Britain Stronger in Europe said the campaigns to leave the EU were “putting Britain’s valuable membership of the single market at risk and cannot guarantee full access if we leave Europe.”
It said one piece of independent research showed UK goods trade with the EU was 55% higher because of EU membership.
The research, from the Centre for European Reform, suggested the effect of EU membership in 2014 was worth £133bn to 200,000 British firms that import and export.
Source: bbc