CG/CHC Stornoway is 24 hours and regularly doing mountain work, night and day, summer and winter. They are not contracted to have a low light capability, so do not have NVG. In extreme low light conditions, other aircraft must be deployed.
MCA Aviation have stated that the Gap SAR technical requirements are broadly similar to the 2007 contract, so no contractual requirement for a low light capability (NVG) and, presumably, not the best comms fit.
The effect of a contractor change, with similar technical requirements and the same a/c type, is going to be extremely interesting.
(With LC on CAA & NVIS, though NVIS from a standing start is always likely to be problematic.)