Not every person who worked on this episode was credited. The absence of a credit for a position doesn't necessarily mean the job wasn't required. The information above is based solely on observations of the actual end credits of the episodes as broadcast, and does not relay information from IMDB or other sources.
Elements retained in Cut Down[]
Christopher Eccleston discussing his first night of filming with the TARDIS prop.
The make up effects used to realise the Gelth.
The realisation of the new TARDIS interior set, and cast & crew opinions on it. (significantly shortened)
Edward Thomas discussing the organic materials and styles he incorporated into the new TARDIS interior. (shortened)
Filming on The Unquiet Dead, specifically finding accurate looking period architecture in Wales, coordinating the extras, and managing the fake snow. (shortened)