Tomkins, 63, recalls working on designs for the Weasley family home, The Burrow, which he described as having a “real kind of eccentric character to it”.
A quarter of a century later, his work is displayed at the Warner Bros Studio Tour in Watford.
He explained: “We were so delighted the studio tour was built and showcases all the fantastic sets, props and costumes that we created for the films.”
The pair said they were excited to see how the upcoming HBO Harry Potter TV series would re-imagine the stories.