The UK Independence Party claims to be ‘changing the face of British politics’. The big support it received in the May 2013 county council elections certainly came as a shock to the three so-called ‘main’ parties, with one of these parties – the Liberal Democrats – receiving far fewer votes than UKIP. (The LibDems had 14% of the vote and UKIP 23%, and UKIP was in fact only 2% behind the Conservatives.) However, opinion polls tend to show UKIP support at only just into the double digits per cent and not much above the LibDems. Are the opinion polls telling the truth? UKIP is doing far better in local government elections than in the opinion polls. In the following note I compare opinion poll and local election results since late August. In the 47 local government elections analysed the UKIP vote share was 19.0% and its average result where it stood was 20.8%. (But note that this 20.8% was lower than the 2nd May figure! Admittedly, the difference is small.) By contrast, the UKIP share in the 59 opinion polls compiled by UK Polling Report in this period was 11.6%. On this basis, the opinion polls are seriously understating the size of the prospective UKIP vote in both the European elections of 2014 and the general election of 2015. It also needs to be emphasized that the UKIP share in local government elections has climbed from 3.1% in 2010 to 19% plus in 2013. If it continued to make gains at this sort of rate, it would certainly be ‘a major party’ in the 2015 general election and could even win it. For clarity, this is not what I expect, but for some years to come fluctuations in the UKIP vote share, around a rising trend, are likely to disrupt the thee-party, Lib-Lab-Con pattern of British politics which began in the 1980s. (This pattern began with the formation and rise of the Social Democrats, and their eventual absorption into the Liberal Party.) It is unclear whether a four-party pattern (Labour, Conservatives, UKIP and LibDems) or a three-party pattern will now develop, but a case can be made that UKIP will supplant the LibDems as the third party.