Labour lost one seat of their 2012 election total but held all of the other seats they were defending, albeit many with reduced majorities. (en.wikipedia.org)
Preston is currently held for Labour by Mark Hendrick, who will be defending a slightly reduced majority of around 8,500 after boundary changes are taken into account. (conservativehome.blogs.com)
Labour went on to win the 1950 general election, but with a much reduced majority of five seats. (en.wikipedia.org)