Here is a two way switching solution posted for one of our users who had run the power feed to one of the switch boxes and had no radial circuit to pick up a neutral at the lamp holder.
We have just added additional circuit diagrams to the two way switching page.
This particular page shows two way switching in the old cable colours linking to a looped radial circuit that uses ceiling roses. As some older houses with these old cable colours may have looped radial circuits utilising junction boxes we have added an additionl circuit diagram that shows this. Check it out here: