Rights of light application for a certificate under section 2 of the Rights of Light Act 1959
The subject of rights to light concerns the assessment of whether a proposed obstruction (for example, an additional storey on a building) is likely to interfere materially with a neighbour's easement of light.
If time is a critical factor (for example, the dominant owner's windows are just on the point of attaining their prescriptive right to light), a temporary certificate can be requested as a matter of urgency.
This is a letter that can be used to apply for such a certificate.