Cortana - anywhere? How do you do it?



I am an ex-Windows phone user (yeah, Windows phones really were useless for the limited apps, but their ease of use was amazing). I miss Cortana (I like Ok Google, but Cortana has personality).

I am in Sweden and I can't get Cortana here (I want it in English anyway) and I can't seem to work out how to fool Google Store that I am in the UK or US. Then do I need to fool the phone that I am in the UK or US as well?

How can this be done? Has anyone done it successfully? Am I at risk of missing out on something if I change my region to UK or US?