It ended up being the dishwasher!! My wife was setting it to go when we were going to bed. It will be going to the tip very soon (the dishwasher not the wife!!)
Hi Folks hope you can help..... I have a Wylex consumer unit fitted at home with about 8 seperate MCB's for the different circuits. These are the clip in replacements for old cartridge fuse holders. Over the last few nights the main RCD switch has been tripping. This is happening in the early hours ...