Written by Helen Jackson.
Thought this might interest you. You know that we've been economising on our character models - to create a new character we re-use an existing body so that we only need to create a new head (see Demi Remi). You also know that our characters are coloured using "texture maps" - 2D image files that are wrapped around the 3D computer models (see Aileen unwrapped). So, you've probably figured out that we didn't create an entirely new character model when we needed to show Aileen's Mum in episode 6. The two characters have a very strong family resemblance...
...because the computer models are identical. All the differences are in the texture maps:
Aileen's Mum looks very good for her age! We would have given her wrinkles, but she's only seen from behind or with her face in shade so there was no point.