Today, I called my cousin, a drama student, to see whether getting her to do the voiceover would be possible. Unfortunately, she is going to be stuck in Manchester, at university, for the rest of the month. This means I wouldn't be able to get a decent recording from her.
The other option is to use my classmate, Sam, to do the voiceover. He voiced for my pitch animation and currently, he's my fallback; I will continue to research more possibilities for voiceovers.