[ivanbakel]

Italy and Germany were both unified much more recently than Spain, and by popular nationalist movements. The selection of their national dialects was basically artificial, since Tuscan Italian and Hochdeutsch were not widely spoken in either country.

The status of languages like Castillan is much more controversial, because they are only the national dialect by conquest. (French is in a similar position, though it cleverly shares the name with the country it is the national language of.) It doesn't help that the French and Spanish governments have historically suppressed "dialects" in favour of the national language in an immoral and shameful way.

>The case of English is different as the language was mainly used una part of the country

English is the most used language throughout the UK. There are almost no non-English-speaking communities left in Wales or Scotland, and language (much like everything else to do with the English) is a contentious political issue in Northern Ireland.

However, it would be grossly inappropriate to start calling this language "British", even when just referring to how it is spoken in the UK - because of many of the same historical features as Castillan and French.