"Mike" wrote in message
...

Can anyone explain how to wire up this 2-way switching?

If you don't understand it and don't want to run three core + E cable
between the switch points you can use RF switches to do the job.

http://www.letsautomate.com/index.cf...=lightswitches has a selection of
them (they may be cheaper elsewhere).

It also avoids any Part P problems as you aren't doing any new circuits.