This is a precedent letter of instruction to a rights of light surveyor where a client is considering undertaking a proposed development and needs expert advice as to whether that development is likely to result in actionable interference with any rights of light enjoyed by neighbouring properties. In addition to providing guidance on the form and contents of, including documents to enclose with, the letter instructing the expert, it also covers important issues including the conflicts of interest, the expert’s fees, privilege and confidentiality.