Short term analysis led me to believe it was successful but that customer retention was limited, the emphasis being more on instant purchase (services, not products) than a shift to using our company than that of a competitor or being a new purchaser trialling the service.
However, after stopping Royal Mail drops and mixing the advertising calendar a little more, the residual effect of the Royal Mail drops started to come through. Secondary advertising outside of Royal Mail was reinforced by advertising elsewhere. Furthermore, when we revisited Royal Mail, the increase in prospects rallied upwards not only on back of the current advert but also on the repeated message of multiple Royal Mail drops getting across.
Thus, Royal Mail drops became a firm part of the advertising calendar. Whatever the costs, it is difficult to beat at around 5/6p per leaflet (or importantly per booklet) directional down to second AB10 1, AB10 2, etc. level.
There is no solus option I admit but you can't get that for 5p per leaflet anywhere.