HMP Wandsworth’s IMB is made up of volunteers tasked by ministers with scrutinising conditions in custody.The prison’s heating problems will continue until systems are replaced in their entirety, “rather than patched up in a piecemeal manner”, the report warned.Prisoners at the category B jail are being housed in “unsafe, overcrowded, unsanitary and squalid conditions,” the IMB concluded.”The severe physical limitations of the Victorian buildings remain, with inhumane living conditions,” it said.