It is that area of politics where these three have arrived at a tacit agreement to keep a particular social grievance out of the mainstream and to permit the system to continue largely unaltered. The problem must never be highlighted, publicised, debated or even mentioned. It will be noticeably absent from all manifestos.
This includes: our membership of the European Union; the fact that the punishment very seldom fits the crime in our courts; the casual ignoring of the problems caused by teenage pregnancies; rampant and silly bureaucracy; the failure to control our borders; ongoing loss of national rights to self determination; failures to tackle widespread benefit fraud and much, much more.
Where problems run truly deep, largely resulting from the failure of earlier liberal left idealism, they place these 'off the agenda' whilst the public splutter in impotent fury.