@ Franko
"why has it got to be called English"
Ah ! Now here I can speak as an 'expert'. English & Scottish are NOT the same language. They share a lot of words & have many others which are similar, hence speakers of both languages can (sometimes) understand each other, much like Breton & Welsh speakers.
I know this because although I was born in England, my dad was from Glasgow (Ma da' wuz frae Glesca)
See what I mean, Franko ? LOL ;-)