a left-winger in a marginal seat, which is even more unusual.
Generally true, although the 1997 Labour intake had some such examples, including Bob-Marshall-Andrews in Medway, Phil Sawford in Kettering and John Cryer in Hornchurch..
I reckon such lefties got in because the Millbank set never expected Labour could win these seats..
I'm sure everyone has noticed it, but a lot of Labour left-wingers elected in 1983 were in seats held by SDP defectors.. Amusing but unsurprising how the SDP defectors effectively pushed the Parliamentary Labour party to the left..