Trying to renovate bathroom--low voltage lights need to be replaced, and was going to use mains voltage downlighters. Problem being I cannot find/access the existing transformers, as there has been an attic conversion, so I cannot get full access to the loft space. The only cable giving 240v reading is the cable to the ceiling pull cord. That then reads 0 when lights switched on. How can I bypass the transformers, or am I stuck with just replacing existing lights with new low voltage ones. Further point, my girlfriend has asked for dimmable lights to be used......once pull cord cable placed outside bathroom, can I just fit dimmer switch, hoping that the existing transformers are dimmer compatable? The mains voltage light kit that I have purchased, but not been able to fit is dimmable. Any help or suggestions much appreciated.