Childrens diy/home decorating program I think on ITV or BBC ?

[Lili_Miami]

I remember this program a few years back maybe year 2000+, where the children sent the adults away for a week or so and totally made over the house with wacky things like putting in a slide, a cinema, secret rooms, pools etc. They sent bits of the house (eg windows and staircase) to the parents to give them an idea of what they were doing. I can't remember the name of the program and have looked all over the internet for it but no such luck.
The title screen had devil horns above the title and I think a woman presented it. If anyone could help me, that would be great thank you!