Does Brian Aldiss not play well with other authors? Ian Watson said the two of them were enemies, which seems a weighty word. It also seems to me that the zombie movie 28 Days Later stole shamelessly from this story. Both protagonists wake up in a hospital to find a disaster has taken place; both are drafted by militant survivalists who hole up in country mansions.
Characters also reflect cultural expectations of their times. That’s important to remember.