Families of some of the British soldiers killed in Iraq have delivered a letter to Prime Minister Tony Blair, keeping the contentious invasion in the headlines as election campaigning enters its final day. They are demanding an independent public inquiry into the legality of the war.Rose Gentle’s teenage son was killed in Basra last year. She said: “What we’ve been saying, what I’ve been saying, since Gordon got killed nine months ago is that this war was illegal and Tony Blair killed my son. Now the report is out, other families are here and they’ll begin to speak up too, and they’ll realise their families have been killed as well for Tony Blair’s lies and we’re determined to see Tony Blair pay for this.” Latest polls show Labour comfortably ahead, though. A survey by MORI put them on 39 per cent, up three points on last week. If repeated on Thursday, that would give Blair a still-huge 146-seat parliamentary majority, down from 161 seats. Campaigning in central England yesterday, the Conservative leader Michael Howard ignored Iraq in favour of domestic issues including crime, immigration and taxes. He accused Blair of having no positive programme for government. The Liberal Democrats, meanwhile, are predicting their best result in a generation. Party leader Charles Kennedy said the spectre of Iraq would continue to haunt Tony Blair.