Tory lead recovers but hung parliament is still likely.
Tory lead cut to just two points in new YouGov poll.
Latest Ipsos MORI poll puts Tory lead at lowest level since December 2008.
YouGov poll for the Sunday Times (21 February) reveals narrowest Tory lead since 2008.
Conservatives on track for a small majority as party rises two points.
Tory lead rises to 12 per cent in first poll since leadership crisis
Back in hung parliament territory
New survey shows Tory lead narrowing to 10 points
Poll finds 57 per cent oppose independence as Salmond prepares to publish referendum plans