Title: East of Ealing
Description: #3 in the legendary Brentford Trilogy (9 books!)

(From Wikipedia) Pooley and Omally are forced to deal with a high-tech Satanic takeover of Earth by way of barcoding the entire population, aided by a temporally-relocated version of Sherlock Holmes.
Subjects: Brentford Trilogy, humour, fantasy, fiction, Flying Swan (fictional pub), thriller, surrealist, Fiction, science fiction, general, Jim Pooley (Fictitious character), Fiction, John Omally (Fictitious character)
Places: West London, Brentford
People: Sherlock Holmes (fictional character), Professor Slocombe (fictional character), Pooley (fictional character), Omally