John Brace
From Tardis Wiki, the free Doctor Who reference
John Brace was the visual effects designer for Full Circle, The Five Doctors, and Revelation of the Daleks.
His career seems to have started in 1979 with work on Terry and June, starring June Whitfield. He then provided visual effects for the original pilot of Richard Curtis' Blackadder with Rowan Atkinson, and then worked on The Young Ones, and the 1987 BAFTA winner for "Best Drama Series", The Life and Loves of a She-Devil. Brace's work after 1987's Gaudy Night with Caroline John — if any — is not well documented.