What constitutes the UK mainland? One definition (that many delivery companies use) would be anywhere you can drive to without needing to take a ferry. Under that definition Skye, although clearly an island, is part of the UK mainland. That means that the most westerly point of the mainland is to be found on Skye and not on Ardnamurchan as I'd always thought (in my defense when I went to the most westerly tip of Ardnamurchan the Skye bridge hadn't been built).
The most westerly point on Skye is Neist Point and we made the short walk from the car park out to the coast. Of course the view west from the very edge of Skye would be just sea so I stopped a few yards short to take a slightly more interesting photo.