Tim Jeffery
Both the end credits and BBC iPlayer subtitles spell this character's surname as "Jeffrey", therefore this page should be renamed to Tim Jeffrey.
Talk about it here.
Tim Jeffery was a new science teacher at Park Vale School who taught in Lab 2A. In the 2000s, Glune Fex Fize Sharlaveer-Slam Slitheen, disguised as headmaster Greg Blakeman, took Jeffery to the new science labs under the belief that Mr Blakeman had something "very particular" to show him before breaking wind in front of him which Tim laughs off showing he was an understanding man. His glasses were taken off him by Mr Blakeman putting him in a state of confusion. Kist Magg Thek Lutiven-Day Slitheen then tapped him on the shoulder. When Jeffery turned around, Kist Magg proceeded to skin him alive. Tim died screaming. His skin was used for a few days after the incident and later abandoned in the IT suit of Park Vale School befor later being cleared up by UNIT. (TV: Revenge of the Slitheen)