The watching brief involved the breaking out and subsequent removal of the concrete floor surface, leaving the sub-base to be inspected by a professional archaeologist from the Archaeological Practice Ltd. This involved careful hand excavation of the pre-floor surface, to clean back any obscuring flooring debris and expose the underlying stratigraphy for potential archaeological remains. Following the excavation, the watching brief area was recorded by measured survey and by photography (see Illus. 06 and Photos 1-10) and the stratigraphic make-up of the subsurface levels reported upon. The Field Investigation was carried out by means of an Archaeological Watching Brief; all work was carried out in line with the Institute for Archaeologists By-Laws - Code of Conduct (CIFA 2010) and the Yorkshire, The Humber and the North East Regional Statement of Good Practice for Archaeology in the Development Process (2009). Accordingly, all excavations were closely monitored, or conducted by, a suitably trained and experienced archaeologist from The Archaeological Practice Ltd. An archaeological watching brief was conducted in November 2022 to mitigate the impact of groundworks associated with the removal and replacement of a concrete floor in the Butler's Pantry of Lindisfarne Castle, the National Trust property on Holy Island. It was concluded that no significant archaeological remains or discernible features of any kind were disturbed during the works. Beneath the modern concrete floor was a coal-rich silty-ash layer [04] observed throughout the entire excavation area and interpreted as cumulative, residual waste from historic coalstorage dating from the late post-medieval - early modern period.