About the Welsh accent
Welsh voice actors speaking English with a Welsh accent is fondly called 'Wenglish'— a dialect of English spoken by native Welsh people.
Many Welsh citizens are bi-lingual and speak both Welsh and English natively. The Welsh-English dialect includes many often-used phrases, including "look you" to get attention, or the word "tidy", used to describe...well, anything! E.g. "that's a tidy salad!".
Other commonly heard Welsh words include "Tamping", meaning furious – 'I'm absolutely tamping', and "Humming", a synonym for disgusting - 'that pie looks humming' are also very common to hear.