Hi, We have an old (1900s) house which has solid walls and as a result after 2 people have showered it gets pretty damp in the winter. I would like to fit an extractor fan. There is not one present currently. I have a good knowledge of electrics but was unsure if i was permitted to do this as a DIY task under part P regulations. In addition our lighting circuit is not protected by RCD (we have MCBs but no RCD). If i am not allowed to do this myself, would i need to have a new fusebox too to become compliant with Part P? Thanks