The final Country and Nationality list (Including CSV versions) can be found at the following link:
As previously advised, we now intend to implement these revised versions on Thursday 1st February 2018.
Companies House would like to take this opportunity to thank all the developers who responded for their helpful contributions and feedback on the initial versions of this.
I would add however that what was clear from the feedback is that in general, recipitents wanted different things, and as such it has unfortunately not been possible to satisfy all of the issues raised, bearing in mind that our aim has always been to improve the quality of data on the register and to keep things as simple as possible.
SDN