Private investigator London, and throughout the UK. We have over 35 years of investigative and surveillance experience from within the police and military and are experts in our field. We have been awarded a number of commendations for our investigative skills and professionalism. With a team of expert private detectives based throughout the UK, we can act fast, and get you the answers to your questions as efficiently and as cost-effective as possible. With experience in dealing with every scenario imaginable our time-served private investigators are fully trained in all areas of private investigative work. If you need to hire private investigators in London, or anywhere throughout the United Kingdom - call Principal Investigations.