WASP has several Current Cost monitors supplied by Scottish Hydro. These can be attached to the output from your meter and the display can be placed anywhere inside the house. It needs to be set to the cost per unit you are paying and then the display will show you the amount of electricity you are currently using and the daily and monthly cost. As you switch appliances on and off you can see how much energy that device is using and how much it costs to run. 

You can get these devices from Scottish Hydro if you transfer to a green tariff or go onto a ‘reduce my energy scheme’ but WASP has a few you can borrow and Brid can help you set it up.