The death of Gerald Kaufman on 26th February 2017 left the decidedly non-marginal seat of Manchester Gorton vacant. The by-election was to be held on 4th May, the same time as local council elections and when Andy Burnham will be the labour candidate for the mayor of Manchester. The Labour party by-election candidate is Afzal Khan.
George Galloway is also standing and commented on Labour's all-Asian slate, allegedly organised by Keith Vaz (see Telegraph article).
The by-election was interrupted by the general election won for Labour by M. Khan with 76.4% of the vote and a majority of 31,730. Galloway came third, just ahead of the LibDem candidate.
Number Crucher Politics suggests, perhaps counter-intuitively, that the LibDems might be best placed to upset the apple-cart there.
At the time this site was first written (Feb 2017), there were two by-elections in prospect, both caused by Labour MPs bailing out from the Corbyn leadership.
Tristram Hunt left Stoke-on-Trent Central to take the top job at the V&A.
The seat was retained for Labour by a lackluster Gareth Snell against a controversial Paul Nuttall for UKIP. The majority was 2,620..