Finding droppings beneath a sink naturally draws attention to the cupboard itself, but the visible location is only one part of the question. In a Heston home, an inspection may need to compare kitchen fittings with the point where pipes cross a wall, a utility area or an accessible outside boundary. None of these features proves an entry route on its own. Tell the technician whether the marks are new, whether you have recently moved an appliance and whether you hear activity elsewhere. That history helps separate an active concern from material exposed during cleaning or repairs.
If your property shares a passage, bin area or adjoining wall, describe that arrangement when making the enquiry. A treatment carried out inside one home cannot establish the condition of spaces that have not been inspected. There may be a need to involve a landlord, managing agent or neighbour for access, but that decision should follow the evidence. Avoid sealing a suspected route simply because it looks plausible: the sequence of control and proofing matters, and ventilation or drainage must not be obstructed. Ask which openings warrant further checking and who should handle any building work.
The most useful outcome is a plan you can understand and follow between visits. Ask which signs to record, which areas to leave undisturbed and how the next assessment will judge progress. If treatment equipment is installed, its position should remain as agreed unless the technician gives different instructions. Keep children and pets away from it and report accidental disturbance. A quieter evening may be encouraging, but the decision to close the case should consider the pest, the evidence and any outstanding access or repair issues.