Additionally in order to make the design even safer (with respect to dealing with the 230V AC supply) I added a second relay. The reason is that if I had used the on-board relay full 230V AC would be arriving on the relay terminals on the board. Instead a second relay is driven using the relay that is on the board. As you can see in the images the on-board relay is orange in color whereas the second relay is separate to the board and has Red tape over it. So whenever the relay on the board is driven it provides supply to the external relay turning the second relay ON or OFF.