I note that in AlanH's first and second photos there is a commissioned officer (or WO?) from the Royal Regiment of Scotland in the crowd wearing (I looked it up) a 'warm weather shirt, blue'....which is part of shirt sleeve order.

I recall Argyll officers wearing grey shirts, Queens Own Highlanders wearing blue and not green jumpers but I can't recall any of the former regiments of the (then) Scottish Division wearing light blue shirts.

Does anyone know which former regiment these have been adopted from?