In the bathroom i have got 2 dome shaped ceiling lights which are quite old. One of the domes cracked, but one remains still over the toilet which is lucky lol. I have got 2 B&Q lights to put up, but the terminal that comes with the lights only has 2 connections (it needs to be earthed). How can i fix this? I'll send photos of my current lights and from certain pages in the instruction manual. Thanks again.