Just a thought because I believe the SWT 450/444 (or whatever goes to Weymouth) announcer has done the Maths listening exams in the 2009 paper.
Are there any other announcers that announce other things other than trains such as narrating TV shows, public service announcements, or even buses?
I believe the announcer on Croydon Tramlink was the voice behind some "Paddington Bear" audiobooks that I listened to as a child a good number of years ago. I'm always quite amused by that!
A lot of the auto-announcers are voiced by professional artists who offer a range of styles and accents for recordings. They are either freelance workers or are employed via an agency who selects their profile for various recordings.
The well-known voice of Phil Sayer, for example, is used for several stations' announcements, but he also records for adverts and the like.
Some voices are not so commonly used in the media, advertising, etc.
I believe a member of rail staff (named Matt?) is on this forum (so his full-time job is not as a voiceover artist or anything like that) but he has been selected to record some new announcements on FCC (IIRC!).