Reference booking in/out (UK relevant)
As part of the granting of planning permission for various airstrips which have achieved planning consent, it has been stipulated in the operating Conditions by HM Government Planning Inspectorate in one case, and the appropriate Local Planning Authorities in the others, that an airfield movement log* must be maintained. Such a log to be available for inspection upon request.
The airfields are restricted to annual movement caps. In one case specific days of operation and restriction on times come into play. Hence the need to have a movement record for official purposes. That the Government Inspectorate made such a stipulation does suggest it is 'official'.
That such a Log is maintained has equal benefits when visits are made by the likes of Border Force/Police. Ask them to sign and date your log to record their visit. Can be a helpful reference in the future.
* we choose to record pilot name, runway used, inbound/outbound airfield/local flight. The authorities are primarily interested in date/time/aircraft reg+type to see if movement totals are being exceeded. The other details are for reference in the case of safety overdue, noise complaints etc.