Keith, I am a member of UKIP, having renewed my membership in October last month. There is no "if". I have a membership card that can quite prove this if you wish to see it
Paul, Yougov very recently placed UKIP at 7% popularity. Almost level with the LibDems then.
But among some groups of voters as defined in polling statistics (which are class-based ie working class, highly skilled, average, low-paid etc.), the support is at 11%.
However, the total 7% as recognised by Yougov evidently did not state "others", but UKIP.
In fact, the three parties you mention together come to 84%, so that leaves 14% for the others, and half of that 14% is our party.
In recent by-elections over the past months, UKIP have come second twice, so the trend is is there, and it is an upwards trend.
