First time I’ve seen the Metro ‘M’ symbol used on a Stagecoach destination: https://flic.kr/p/2mPY37n 

Could’ve been a bit bigger but nice it features nonetheless. Also, do you think it’s been included purely because it’s short-route destination so there was room for it? 

GNE only seem to include ‘M’ symbols on their Metro replacement buses - only if it’s a Streetdeck with double height destination screens:  https://flic.kr/p/2mPELpY

I always think the likes of GNE’s route 1 should have a ‘M’ symbol on their destination screens to indicate where in Gateshead it actually terminates. If there’s no room then maybe add ‘Int.’ for interchange.
‘Gateshead’ is rather vague.