Both this and borrowed line would mean the supply and return are not following the same path, although not banned it would mean high chance of interference with hearing aids and the like. It should be avoided if possible.
the rings show the three cables, you will note with the triple and earth the brown is permanent line so it can in DC theory be taken from any other permanent line supply from the same protective device, if not from same protective device it is classed as a borrowed neutral even though you have borrowed the line.
Several manufacturers do master and slave switches that only require 2 wires to the slave switch, though I can only see dimmer versions from the quick look I had. Might be another option.
The cables were run through a bit of stud wall to get to original switch, which involved a few strategic holes, then along quite a long wall in the zone below the ceiling which now has coving fitted. The second switch was a last minute afterthought, hence the lack of research. It isn't essential and definitely not worth redoing the decoration work already done.
I'll look at the switches suggested by Echo, other than that we will make do with just one light on a two-way
They're essentially the same thing already recommended by me (Fibaro) and another poster (linked to a remote switching device on tlc direct I think) - an intelligent lighting control device that is activated from the remote switch using a two wire "push to make" style switching. Does seem to be slightly cheaper than other systems suggested, but you'll still probably be looking at around 50 quid per circuit as they seem to advocate that you have to buy their switch for every switching point, whereas with the other suggestions, you use cheap normal switches and one expensive module. Personally I think smart lighting is worth it, but I'm really pleased with my intelligent lighting install; especially being able to turn all house lights off with one tap on an app button, after climbing into bed
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