Ken Ledsham is a BAFTA-nominated designer with a long string of credits dating back to the mid-1970s. His work for the Doctor Who story The Ribos Operation was one of his very first jobs as the lead designer for a television episode. He also designed Destiny of the Daleks and The Kings's Demons. He was also the uncredited design assistant on The Time Monster. (INFO: The Time Monster)
However, the bulk of his work can be found in other famous British television programs, like Lovejoy and the more recent Judge John Deed.
A few of these jobs have Doctor Who connections. He designed several episodes of Campion, starring Peter Davison. He received his first BAFTA nomination for House of Cards, directed by Paul Seed, who had played the Graff Vynda-K in The Ribos Operation.