The guides rely on a team of Site Assessors, all of whom are experienced caravanners or motorcaravanners, to visit and recommend parks.

The Assessors consider and evaluate: The guides try to cater for a wide variety of preferences; from those seeking a small peaceful campsite in the heart of the countryside, to visitors looking for an 'all singing, all dancing' park in a popular seaside resort.

In the introduction to the first guide Alan wrote "I would like to stress that the camps which are included in this book have been chosen entirely on merit and no payment of any sort is made by them for their inclusion."

By the time the Mark Hammerton Group acquired the company from Clive and Lois in 2001 shortly after Alan Rogers' death the Guides had developed from featuring less than 100 campsites in Britain, France and a few other Western European countries to featuring over 1000 campsites throughout Europe, all of which were selected and regularly inspected.

The guides have been influential in the rise in popularity of camping; for example, drawing attention to the number of overseas sites that were providing mains electricity hook-ups.