This may be a tangent, but would you really classify Scots as a distinct language from English (or "standard English", assuming that there is such a thing)? I think the degree of mutual comprehension of written texts is higher than you think; at least I can understand
Scots poetry without any difficulty and my familiarity with it basically extends no further than having watched Rab C. Nesbitt.
I know this is a controversial subject but it seems to me that if a speaker of language A can understand a text of language B with no great difficulty beyond unfamiliar spelling or pronunciation then really they're different dialects rather than different languages. Scots is surely closer to "standard English" (i.e. whatever I personally happen to speak) than, say, some versions of Singlish, which I think has more non-standard vocabulary and more divergent grammar - not to mention even more divergent pronunciation - and so surely has more claim to be considered a distinct language. (This is particularly so when you hear people who speak both Singlish and standard English, and who switch between them in different contexts - the difference is much more than just accent and a bit of slang.)