Overall it's really quite an enjoyable, easy read but it feel like it hasn't been proofread. Every few pages there are errors like "to" being used instead of "too" or "pear" instead of "pair", "poll" instead of "pole". It occasionally has helpful diagrams - for example showing the layout of his street, but it was thrown in seemingly at random a dozen pages after the description of his street. The diary angle was interesting at first, but it quickly became silly (for example he would apparently be writing an entry mid-crisis) and in places he seemed to get mixed up with what tense he was writing in. At times the diary pretence seemed to be completely dropped.
The story is a fairly typical zombie survival story and most of the characters are pretty 2D and generally rather useless (apart from the main character, who seems to be an idealised version of the author). His trusty sidekick John spends the first half of the book loyally waiting in the car/house/tower while our plucky hero does all the work and comes up with all the plans.
In spite of the above, it's still worth a read for zombie fans looking for a nice way to kill a few hours. For anyone who isn't specifically looking for zombies but fancies some horror or post apocalyptic fiction then there are better books elsewhere.