Hi, I'm in the process of changing all of the sockets and switches I'm my house for new ones. However when I have come to change the grid switch the labels on the back of switches are different. On the switches that are there at the moment there are cables listed as L1 & L2 & N1 & N2. The new modular switches are labelled as Co, 1 way and 2 way. I wonder can someone please advise as to what is what on the new switch? I can take pics if necessary. Many thanks in advance.