I found the first book in this series to be strangely compelling, and I found this one for 3 bucks, so I thought I'd give it a shot. I wish I had not.
This book was extremely boring. The author went to great lengths to try to make the bodies appear threatening, but I did not buy it. The idea was that, individually the bodies were weak and easily knocked aside, but they were amassing in huge numbers, which made them a threat. The author explained in great detail (over, and over, and over, etc.) why they were amassing in such numbers and why that made them a threat. (Because they are attracted to noise and apparently living humans, simply by being alive, are noisy. They are also attracted to fire, apparently, which you'd think might help cull their numbers a bit, but I digress.)
I have this problem where I'm not really all that bad at math. I kept wondering where all the rest of the survivors were. If "over 98%" of the population was killed, that leaves somewhere between one and two percent of the population alive somewhere. Last time I checked, there were around 60 million people in Great Britain, not counting foreign students, tourists, migrant workers and the like. That means between 600,000 to 1,200,000 people would have survived. If almost a million people were scattered around the island, presumably at least some of the bodies would be attracted to each of them as well, because being alive is noisy.
After "over 98%" of the population dropped dead, "about 1/3" of them got up again and started shambling. That means there were about 20 million bodies wandering around, give or take. We are told that some of them were trapped in buildings or cars, some of them wandered off cliffs or into rivers or the ocean, some of them undoubtedly would have burned up in some of the numerous building fires. The three survivors ran over some of them with their cars in book one, and many more were run over by military vehicles and cars in this book. Also, many bodies are crushed and mutilated by the press of bodies behind them all trying to squeeze into the same place. Oh yeah, and they tear each other apart occasionally. Not to mention the "thousands" that were lured into a burning building by Donna, which was the only sensible thing anyone did in the story so far.
Presumably the bodies are not capable of reproducing in their quasi-dead state. Survivors do not even turn into roaming bodies if they are bitten (in fact, the bodies do not seem to bite. They simply try to grab you to death.) Also presumably, the other hundreds of thousands of survivors around the island would also be running them over with cars and whatnot. The numbers would have to be constantly dropping.
So, getting rid of them would be tedious to be sure, messy absolutely, but not really scary.
Obviously, I do not recommend this book. It made my head hurt.