The character Derek Faye was based off a fan Catherine Tate had met, assumed was gay and offended when she said she had lots of gay fans (the sketch where the character met Bonnie Langford was almost a word for word retelling of the incident)
It took three and a half hours each day for Catherine Tate to be made up as "Nan".
The character 'Aga Saga woman' was based on an upper-class lady who was rude to Tate on Kings Road whilst she was pregnant.
The character of "The Aga Saga Woman" (aka "Posh Mom") often uses the expression "quick sticks". The phrase comes from a tongue twister commonly recited in elocution lessons.