Conservative co-chair Oliver Dowden has resigned following two by-election defeats. <br /> <br />The Liberal Democrats overturned a huge Tory majority in Tiverton and Honiton in Devon. <br /> <br />It’s their third by-election victory over Boris Johnson’s party in a year. Report by Chanda. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn
