It may be more a quiet sense of relief that the majority was still five figures and the share was up? The low (but not unreasonable - see Manchester Central by election) turnout can be used to mask any other kind of signal from this, but in some regards, maybe a low turnout but increased share...
I think this is the saddest part as it weakens our democracy and underlines the tendency of FPTP systems to evolve towards a two party state. Saying that, the Lib Dems have been totally anonymous since the GE, though this is probably due to the massive drop in funding due to their MP count.
Whatever. If you were interested in facts, try looking at by election results since 2010. I'll even provide a link for you:
http://www.ukpolitical.info/ByElections10.htm
As you can see, the turnout for by elections is always lower than in a GE.
Check out the Newark results - CON hold, but with...