Theresa Gallagher and Keith Wickham worked on the UK Version of Thomas & Friends
Simon Greenall is also the voice of the UK Meerkat Aleksandr Orlov, from the famous adverts.
Peso is (very much notably) played by a different voice actor than the series.
At around 24 minutes, you can see Grouber sitting in the Gup-G with Inklings and the other vegimals despite the fact he went with Tweak and Codish to explore the jungle.