They must be raking it in. It's so easy, no need to put on make-up or get your hair done or spend hours in wardrobe, just schlep down to the studio and say your piece and get a nice check everytime it's shown. They don't even need to learn their lines, no-one can see you reading off the script when it's a voice over.
I'm not sure that I'd recognise Andrew Lincoln's voice, he's pretty neutral isn't he? <thinks back to This Life>
Anyway, neither he nor Max are squeaky, which is my main gripe with Jane and Tony. Especially Tony! Squeaky men are just wrong, unless they have a really likeable personality when it's ignorable if not forgiveable.