The premisesGive uncertainty a useful place in the plan
Not knowing the pest is common, and an uncertain identification should be stated rather than disguised. At a TW20 property, tell us where the sign appeared and what made you concerned. We can then discuss relevant checks without allowing an early guess to determine the whole response.
What you have noticedRecord what you can safely observe
A dated photograph, the material affected and the frequency of sightings help give the report substance. Leave inaccessible spaces and suspected nests undisturbed. If there are several types of signs, explain each on its own so a noise, a mark and an insect are not automatically treated as one cause.