Dear Colin.
Excellent that you have now posted the photos.
I am now even more convinced that this is 51st Highland Division Signal Regiment Pipers uniform.
Collar dogs may be a little later as they look to be stay bright or A/A but that does not detract from the tunic and the Grant Tartan that you show in the album section.
Hope someone can come up with a button date but you can not mistake the date you have stated of 1951.
Brilliant.
Chris Walker
www.signalsbadges.co.uk