In August 2014 he defected to join UKIP (the United Kingdom Independence Party). He resigned his seat to force a by-election which he won in October 2014. Carswell was then re-elected in the May 2015 general election with 44 per cent of the vote - he is UKIP's only MP.
- Henry Jackson Society - political council
- Douglas Carswell, parliament.uk, accessed 14 october 2012
- Nicholas Watt, Tory MP Douglas Carswell defects to UKIP and forces by-election, The Guardian, 28 August 2014, accessed 11 September 2014.
- UKIP gains first elected MP with Clacton win, BBC News, 10 October 2014.
- BBC News Clacton, accessed 11 May 2015.