UK Parliamentary by-elections, 2015 onwards (also devolved legislatures)

[Harry Hayfield]

First By-Election Changes 1950 - 2010
Sheffield, Neepsend (April 5th 1950): Con -0.34%, Lab -2.00%, Comm +2.34%
Bournemouth East and Christchurch (February 6th 1952): Con -1.45%, Lab -1.71%, Lib -1.49%, Ind +4.66%
Gateshead West (December 7th 1955): Con -1.13%, Lab +1.13%
Brighouse and Spenborough (March 17th 1960): Con +0.80%, Lab -0.80%
Harrow West (March 17th 1960): Con -15.14%, Lab -7.71%, Lib +18.15%, Ind +4.70%
Leyton (January 21st 1965): Con +9.42%, Lab -8.00%, Lib -2.23%, Ind +0.81%
Carmarthen (July 14th 1966): Con -4.62%, Lab -13.17%, Lib -4.92%, Plaid +22.71%
St. Marylebone (October 22nd 1970): Con +1.40%, Lab -2.32%, Lib -2.43%, Ind +0.97%, NF +2.38%
Newham South (May 23rd 1974): Con -1.10%, Lab -3.42%, Lib -2.30%, NF +4.59%, Ind Lab +2.23%
Woolwich West (June 26th 1975): Con +10.19%, Lab -5.03%, Lib -9.00%, Ind +0.12%, NF +2.42%, Ind Con +0.29%, Others +1.01%
Manchester Central (September 27th 1979): Con -10.09%, Lab -0.07%, Lib +8.90%, Green +1.22%, NF -1.83%, Others +1.88%
Penrith and the Border (July 28th 1983): Con -12.81%, Lab -5.84%, Alliance +16.71%, Others +1.94%
Glasgow, Govan (July 14th 1988): Con -4.55%, Lab -27.88%, Lib Dem +4.14%, SDP -12.29%, SNP +38.38%, Green +1.15%, Comm +0.30%, Others +0.75%
Kensington (July 14th 1988): Con -5.92%, Lab +4.89%, Lib Dem +10.77%, Lib +0.13%, SDP -12.21%, Green +0.73%, Others +1.60%
Newbury (May 6th 1993): Con -29.02%, Lab -3.97%, Lib Dem +27.76%, SDP +0.06%, UKIP +1.04%, Green -0.22%, Ind Con +0.46%, Others +3.90%
Uxbridge (July 31st 1997): Con +7.56%, Lab -2.52%, Lib Dem -5.28%, Lib +0.22%, UKIP -2.65%, BNP +0.99%, Others +1.68%
Ipswich (November 22nd 2001): Con -2.10%, Lab -7.97%, Lib Dem +7.24%, UKIP -0.60%, Green +0.93%, Ind +0.31%, Ind Lab -0.56%, Others +2.75%
Cheadle (July 14th 2005): Con +2.01%, Lab -4.16%, Lib Dem +3.27%, UKIP -1.03%, BNP -0.89%, Others +0.80%
Oldham East and Saddleworth (January 13th 2011): Con -13.62%, Lab +10.27%, Lib Dem +0.32%, UKIP +1.95%, Green +1.52%, BNP -1.25%, Others +0.82%

[Harry Hayfield]

What currently held seats is Corbyn "destined" to lose?

On a 1% swing to Con: Barrow, Brentford, Chester, Ealing Central, Halifax, Ilford North, Newcastle under Lyme, Wirral West, Wolverhampton South West
On a 2% swing to Con: Dewsbury, Enfield North, Hampstead and Kilburn, Hove, Lancaster, Derbyshire North East
On a 3% swing to Con: Birmingham Northfield, Bridgend, Harrow West, Middlesbrough South, Tooting, Walsall North, Westminster North, Wrexham