Broadfell Prison guard
From Tardis Wiki, the free Doctor Who reference
This Broadfell Prison Guard was one of the many that worked under the Governor and Miss Trefusis. She worked alongside Lucy Saxon in an attempt to kill the Master. Whilst Lucy was imprisoned, she held the potion which could kill the Master and when the revival ceremony took place, she passed it to Lucy and she threw it at the Master. (DW: The End of Time)