Every day we can guarantee that we will be called upon to effect some form of surveillance. The reasons are diverse - it may be a business issue involving an employee or a private, delicate matter, or for legal purposes, obtaining evidence for a pending case - or for many other issues.

Times of day vary from early morning to late at night; it may involve one person working alone, or several working as a team. We find ourselves in cars, taxis, vans, at airports, on trains, tube, motorbikes, bicycles, buses, boats or aircraft

A target who commutes may well use public transport, or a combination of car, train and underground; keeping up with someone in rush hour will sometimes require more than one person, especially if they change modes of transport

Likelihood is that whatever you think will happen, the opposite will apply - which is why all our observers keep an open mind, and change plans as matters develop. Our people are aged from 16 to 65 - blending in to different backgrounds

Contact Answers Investigation on 0207 158 0332 or by email

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