Log books are the files that are issued by the government when you register your vehicle. This file contains all the important information about your vehicle. It contains the information about the engine, the chassis, registration number, and other similar information. A log book loan is a kind of personal loan secured against a car. A UK resident who has a logbook registered in their name is eligible for logbook loans. Lenders in exchange keep the logbook of the borrowers with them against the loan. Borrowers can enjoy the complete freedom of using the car without any restrictions from the lender.