Subscribe to BBC News \r<br>The leaders of 7 political parties are gearing up for a live, two-hour televised general election debate. The contest, announced after weeks of wrangling, will be the only time Conservative PM David Cameron and Labours Ed Miliband will face one another in a debate before polling day. The Lib Dems, SNP, UKIP, Plaid Cymru and the Greens will also take part.Ross Hawkins reports.\r<br>\r<br>Subscribe to BBC News HERE \r<br>Check out our website: \r<br>Facebook: \r<br>Twitter: \r<br>Instagram:
