Eric Sykes is a great screenwriter. The writer for many shows, as well as short and long films. Star of his own series and director of several films, notably great silent shorts such as The Plank and Rhubarb.
But for some reason, it didn't translate into books. It failed to be more than mildly amusing, it failed to be original, the characters failed to be interesting and it failed to drag me in. I gave up.
I don't often give up on books. Normally I plow on. Taking forever to get to the end, plodding through in grim determination because part of me is interested in it. I think the last time I did give up on a book was Lord of the Rings part 1 when I was quite young. It is a long and complicatedly written book that is not accessible for kids. Even kids such as myself who had lapped up The Hobbit. So I put it aside thinking I'd go back when older. 20 years later, I have seen the film of the book, and can happily say that has satisfied me in that department. The book is just too long to embark on (and that's just the 1st part). UFOs Are Coming Wednesday doesn't have that excuse, but demonstrates the new less-patient me in action.
In short: don't buy this book. Rent a copy of The Plank instead.