This "Gurning Man of Glasgow" is the fabrication of an "A.L. Cuin" on some paranormal website. This is the first ever mention of him here: https://www.british-paranormal.co.uk/the-gurning-man-of-glasgow/
The same author fabricated these 'Ghosts of the Glasgow Subway': https://www.british-paranormal.co.uk/ghosts-of-glasgow-subway/ Only the Shields Road one isn't his own creation.