hello all, advice needed, i,m i the middle of converting the loft into a bedroom, i have an existing light switch and double socket in the room below and an existing double socket already in the loft(spur)i want to change the switch in the room below into a two way and also want to install up to 4 wall lights in the loft, i have easy access to all the wiring in the loft (existing lighting ring and junction boxes)what,s the best way to go about it, go off an existing jb or break into the circuit and install a new jb. ta.