In or out?

Some Conservative MPs are stepping up the pressure on David Cameron to offer the great British public an 'in-or-out' referendum on EU membership.

http://www.telegraph.co.uk/news/worldnews/europe/eu/9700867/Tories-cheer-Cameron-in-Europe-and-demand-referendum.html

http://www.telegraph.co.uk/news/politics/9700903/Mark-Pritchard-Only-an-in-out-referendum-will-do.html

Doubtless Cameron's deputy, Nick Clegg, will support this, won't he?   After all his party put this out at the last general election: