How many voters have parties retained?

I did a simple calculation from todays yougov poll. As with all the polls it has done in the past, it asks who you voted for in the 2010 General Election. It then asks who you will vote for now.

So 14% of Conservative voters from 2010 don't know or won't vote they say, this leaves 86% then 77% of this remaining 86% will continue to vote Conservative which is 66.2% So out of 1000 voters 662 will vote Conservative again.

For Labour they had 15% DK/WV and then 82% of that figure
For Libdems it was 23 % DK/WV and then they have retained 33% of the remainder

Other useful posts

FOUR HALF MILLION VOTERS FOR UKIP

The Reading East effect

Values as below

Of every 1000 voters from each party who voted in #GE2010 who would still vote for them now. LABOUR 697 CONSERVATIVES 662 LIBDEMS 254
— General Election (@UKELECTIONS2015) January 29, 2014