One that seems to be becoming less pertinent at 8 / 10  BIS central bankers' speeches  the moment is the international risk posed by ongoing low interest rates and the resulting search for yield by investors. Now that policy interest rates globally are starting to rise, if only slowly, the urgency of the search for yield surely becomes less pressing.
On the domestic front, the Bank has repeatedly pointed to the issues associated with household sector balance sheets. These are probably best regarded as a potential exacerbating factor. That is, if some other shock should come along, debt would make it worse. Of itself, the level of indebtedness is unlikely to be a triggering factor that sparks a negative outcome.