British pronunciation is characterized by strict and precise pronouncing of words in imperative intonation. Such a voice of the text is always more understandable and is perceived more easily with long-term listening.
When you need to voice a large and complex text, turning it into an audio file or an audiobook, you can always refer to the online service - readloud.net. The best system of automatic scoring texts will make for you the conversion. The generated mp3 file is available for listening online and for saving. The voice sounds very natural and practically does not differ from the live voice acting.
Need to sound BBC, like you're having a spot of tea or perhaps a little bit Cockney? Talent listed here can perform a variety of British accents. If you need something more specific, as we know there are nearly as many accents in Britain as there are streets (perhaps a slight exaggeration!), do a keyword search for particular accent and dialects.