Kingsley Amis was (IMHO) one of the best of the post-WWII novelists: amusing, acerbic, his observation was acute and his mimicry of ways of speech unparalleled; as well as all that, his novels and short stories were amazingly varied in setting and storyline. Reading these memoirs, one can see the basis for many of the episodes and characters in his writings. You'll probably enjoy the Memoirs more if you've read some of the novels previously, otherwise the references to them may not be revealing.
Since he is careful not to enlarge on episodes that might cause pain to those nearest to him, a brief overview of his life will enhance understanding of some of the shifts in his circumstances that are not fully explained here. It is well worth the trouble of doing this, for it was a life of considerable interest.
When I read the Memoirs, I wish that I'd known him personally and could have talked with him, or even just listened to him talking with others; it might easily not have been a cosy experience, because he was not a glad sufferer of anything approaching a fool, but it would have been memorable, and I'd have been able to put it in my own memoirs - if only I hadn't been too idle to write them.