The voice in the recording is yours truly! To my ear, the accent is quite similar to the original recording, but something I would like to do differently is record from a greater distance from the mic so that I can speak more aggressively and loudly and maybe get that “poshness” that you mentioned. It might also sound more natural when integrated with the rest of the clip.
Also, is the less than stellar quality of the recording coming through or does it sound okay? I’ve only been able to listen to it on my phone since I’m at work.