WARNING: these are SO BAD! Niall is an American doing a really really awful version of 'Scottish' and Imogen is an Australian (?) who has lived in London for a few years so her accent got weaker.

If you actually need someone who sounds British to British people and you pick these two voices, then you will just end up hurting British people's ears. Better to stick with one of the less annoying American accents. Cederic and Dolores are ok