From time to time I will do a few calculations showing the differences between when elections have been held and when they were last held to show the change in vote shares for the various political partys.
This will be done on a monthly or a particular busy day of elections basis
Click the link for the information.
21st July 2016 (10 English by elections with over 12,000 votes to compare)
9th JULY 2015 (6 English by elections with over 10,000 votes to compare)
1st October 2015 (6 Scottish council by elections with 19,782 votes)