"But there's a misconception that if you have a job in a high profile thing that it pays really well and you're made with your mansion.
"I bang on about it all the time but I worked in Wetherspoons in Monmouth for four or five months when I didn't have any other work, I needed a job and I had bills to pay."
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And beyond needing to pay his bills, Chris also needed something to "keep [him] sane" whilst he looked for other work.
He added to the Daily Mail newspaper: "As much as it's about the need to work because you need the bills to be paid, there's also something about needing to work regardless of what that is.
"You need something to do, you need to keep sane."
The star - who bagged the role of Percy after applying through BBC Newsround - is still connected to the Harry Potter world, and regularly jets to America for conventions, where he meets with fans.
Chris also acts in pantomimes in the UK throughout the festive period, and has also worked on series such as Atlantis, Downton Abbey, and A Discovery of Witches as a production coordinator.