The "North East" is the proper name of a NUTS 1 [0] region of the UK. It is distinguished from your interpretation of it as the "north east of the UK" by its use of capital letters, as is standard in English [1].
[0] https://en.wikipedia.org/wiki/International_Territorial_Leve...
[1] https://en.wikipedia.org/wiki/Proper_noun#Modern_English_cap...