A couple of weeks back I ordered a set of Commonwealth bunting, a Commonwealth flag and a Saltire ready for our summer services/activites and as a 'welcome' for visitors who might happen our way as a result of some little event taking place down the road.
The various parcels arrived - but the saltire seemed wrong even to my untrained eyes, as it had a sky blue ground rather than the more familiar dark blue. So I have now ordered another one and hope it's a 'better' colour. However a bit of research indicates that until 2009, any shade of blue from sky to navy was equally acceptable (and technically I guess still is). In 2009 the Scottish parliament decided that the correct colour is Pantone 300, or in hexadecimal (according to wikepedia) #0065BD.
Oh, and if your interested, which I'm sure you aren't the ground of the union flag is fractionally darker being Pantone 280!!