Un-accessible Connections?

[StagsHeadNo.4]

Hello People,

Where do the Regs stand with un-accessible connections, i.e J.B's under floor boards/Buried in walls. Crimped cable, those new push fit connector blocks etc....

Any points of view would be greatly appreicated, Thanks.
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[keniff]

Generally maintenance free, like wagos or helacon push fit blocks in a wago box or similar are ok to go in most places, along with crimps as they are considered the same, jb's need to go in a place where they are accessible so can be tightened up when they become loose