Apprentice's Question on 2 way with power to the switch

[Marti]

Afternoon Gentlemen,
Been lurking in here for a while; absorbing the knowledge and passing it off as my own ideas and understanding In between my extensive on-site research in to Yorkshire Teabags versus PG Tips I've written some notes (attached as a PDF) to get my head around two way switching with power to the switch. This appears to be the standard my qualified colleagues (God 1, God 2 etc) work to. Can I ask you to look over it and tell me if I'm on the right lines. I've left out the obvious, insulation tape on the screw connectors etc.
Thanks for all you help to date.

 

[telectrix]

although that will work, that's a rather dated way of doing it. and forget tape on choc blocks. use wagos.

the more common method is to loop in at light, take a switch wire to nearest 2 way switch, brown to L1. blue (sleeved brown) to L2. then 3 core to switch 2. usually Black to C, brown to L1, grey to L2. ( sleeve the black and grey).

 

[Richard Burns]

Welcome along.
The first part is OK with the one way switching, the loop in and loop out can go in any common terminal but you want to minimise the cores you need to terminate in each terminal so splitting them up is good.
For the two way switching the writing below the diagram is referring to three wire switching that Telectrix has described above (for a loop in rather than switch fed arrangement) but the diagram is showing two wire switching and also transferring the neutral. In the case shown in the diagram the three core cable would be brown to both L1, Black sleeved brown to both L2, and grey sleeved blue to connectors for the neutral at each switch.
Try again for the two way switching.

some diagrams to either help or confuse the issue:

 

[Marti]

Thanks Telectrix,
Thank you Richard,
Stepped through all your notes, drawing them out with good ol' paper and pens and I finally get it. Something about drawing out instruction makes it easy to remember.