A group of Conservative MPs will attempt to force a Commons vote over a referendum on the UK's European Union membership next week.
The MPs are seeking to engineer a vote on an EU referendum by tabling an amendment to the Queen's speech.
Prime Minister David Cameron earlier defended his approach of seeking fundamental reform and holding a referendum on membership before the end of 2017.
Read more: Ex-chancellor calls for EU exit
More top news
Scientists have discovered the world's deepest fish with wing-like fins and an eel-like tail during research in the depths of the Pacific.
The tranquil district of Hart has been crowned as the place with the best quality of life in the UK for the fourth year in a row.
Britain's immigration system is in 'critical condition' according to the chair of the Home Affairs Select Committee.