In 2010 Cornwall was split 50/50 with 3 of the 6 constituencies held by the Conservatives, the other 3 held by Lib Dems. This year (2015) the conservatives convincingly netted all 6 constituencies. I thought I’d look for further stories using the node-link diagram...
Click on the image below and once the page has loaded, click refresh to make Cornwall’s electorate dance, hold and drag to see how the forces pull and repel other parties. Click a circle to display the constituency, party and number of votes. They are't labelled so guess which huddle of blobs is 2010 and which is 2015. (The growth of the purples should give it away - scary for a county heavily subsidized by Europe!)
Raw data available from the Electoral Commission.