It's definitely Miéville, but the weird doesn't cut in immediately.
The first 100 or so pages is about a young single British woman (Maur) in the 1970s/1980s. She brings up a son who becomes increasingly remote, joins the army, and then something happens to him, which is when the weird elements begin to appear (involving the disturbingly unpleasant lingering spirits of the dead). The second plot strand concerns a Brit soldier (Allardyce) whose unit participates in various weird events (also somewhat disturbing) set against British-empire post-colonial / cold war shenanigans in the 50s and 60s, although the two plot strands eventually connect.
One reviewer I saw described the first bit (which is 'mundane', in the non-fantasy sense) as a masterclass in how to present a character's interiority, and I'm inclined to agree. As with any Miéville, it helps to have access to a good dictionary. I'm a Brit who grew up at approximately the same time as Maur, which helped me understand some of the allusions (e.g. to 'the election', which is Thatcher's). But I had to read into the darker sides of British colonial disengagement to fully understand Allardyce's experiences. E.g. the so-called Malayan Emergency, a particularly brutal little war of independence in the 1950s.
In a way, it reminded me of Kraken, where Miéville throws in lots of references to real-world weirdness to better sneak his own inventions into the story world.