wearing other family tartan rather than your own

[Jock Scot]

Aha "Official channels" sometimes don't necessarily exist in writing in matters such as these and it is a very British thing and causes confusion and misunderstandings to the unwary and particularly to the unwary foreigner! There are many unwritten conventions in UK society, even these days, that go under the headings of "its just not done", or conversely, "that is the way it is done" and confusing though it is, even though it is unwritten----anywhere----there is still the "propper way of doing things"! Do not rely on the fact that something is written down with British conventions and if it is not written down then it must be OK to do it,or not, as the case may be.That would be probably be a big mistake!