It's not (except from TomTom's selections), but now I wonder which "Classic" the OP has? It's another one of those names that TT has 'reused' several times over the years. Based upon the request, I was assuming it was a Nav2. TomTom no longer shows the big list of Nav2 voices on their web site, but as noted, they're available elsewhere now.
@FarTilFire74
What are the first two characters of your device's serial number?
B1, XM, GV, GQ, GX (Nav2) (you can add the voices I pointed to)
or
G3, G4, G5, X5, X6, X7, X8 (Nav4) (you cannot add the voices I pointed to)
All of those models used 'Classic' in the name.