And what will the fire brigade do when they come across a burning house with PV panels at 80-100V DC and inverters creating 240 - 415V AC that they cannot switch off?
They will adopt the controlled burn - IE protect the adjacent premises from combustion from embers and radiated heat whilst permitting the premises on fire to burn down.
Of course many of those in social housing cannot afford to insure their goods and will therefore loose everything.
I have yet to see a PV system with relay system in which, when the incoming mains is shut off, the PV inverter automatically shuts down. But the PV panels still remain live and the DC at the currents produced from these panels is more dangerous than AC!
Loft inspections also become more risky or impossible without an access key.
I also hope that Manchester and others get the retro fitted insulation right. I have visited many properties that were unaffected by mould until insulation was installed as cold spots are created.