Attic

The Attic isn't seen for years, viewers can see the stairs that lead up there but never see the attic until Season 7.

It is originally a space to keep old family things and is then offered to Peter as an office space. However, Georgie is upset as she wanted to move up there so she doesn't have to share a room with Katie. She is then given the space for her bedroom.

When Luke moves in he goes up to the attic when Georgie moves to the Loft.

After Luke goes back to live with his Mum, Katie is adamant she's taking the attic.