I've never noticed that some of these rats have a Cockney accent (like Spike, Whitey and Sid). Roddy speaks with an Aussie accent, Rita and Toad speak with a normal RP, and, Le Frog, he's French, he obviously would have an improvised dialect.
Here's my trivia: Roddy St James was voiced by Hugh Jackman, best known for his role as the Wolverine from X-Men, Rita Malone was voiced by Kate Winslet, best known for her role as Rose from Titanic, The Toad was voiced by Sir Ian McKellen, best known for his role as Gandalf from The Lord of the Rings, Spike was voiced by Andy Serkis, best known for his role as Gollum from The Lord of the Rings, Whitey was voiced by Bill Nighy, best known for his role as Davy Jones from Pirates of the Caribbean, Sid was voiced by Shane Richie, best known for his role as Alfie Moon from EastEnders, Le Frog was voiced by Jean Reno, best known for his role as Gendarme Ponton from The Pink Panther.
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