Will a phone bought from another EU country work 100% in the UK?

[Hades]

I see that a particular phone is different prices in different countries. I can order it cheaper from amazon.fr, amazon.es and amazon.de. Are there any disadvantages to buying one from there? e.g. will it work as a UK phone and would it still receive updates while here?

Thanks.

 

[Hades]

Thanks.