[94] The SNP increased their number of councillors elected in 2017 than it did in 2012, with 431 being elected, compared to 425 in the 2012 local elections. (en.wikipedia.org)
The last Tory district councillor elected in Ashfield constituency boundaries lost their seat (I think) in 2003. (ukpollingreport.co.uk)
It ignores, for example, the number of councillors elected for each ward. (totalpolitics.com)