Labour vote fragments in Birmingham
An initial glance at the results for Birmingham shows the Labour vote fragmenting.
For example they lost the Moseley and Kings Heath seat to the Lib Dems. Labour had only 31% of the vote. However, the opposition to Labour was fragmented and we had about 33% of the vote - enough to win, however.
Because of the boundary changes comparisons need to be made to the all up elections, but that is relatively difficult because sometimes parties (eg UKIP, Green, BNP) only put up 1 candidate in those situations.
There are two comparison techniques the largest vote technique and the percentage of overall vote technique. Both of these have their problems.