Indeed. I presume that when the OP said "...I'd like the wiring to terminate at the last in-line wall light, without having to go on and complete a circuit" he meant that he din't want to have to create a ring - which, as has been said, is something that is very rarely done (or necessary) in a lighting circuit.
Glad you said rarely, no doubt Winston will say point blank its NEVER done.
I'll bet it's less rarely done than necessary.
Well, I know for a fact that it is sometimes done unnecessarily, since I inherited at least a couple of 'lighting rings' in my present house - so I could certainly not say 'never', and could authoritatively challenge winston if he suggested 'never'!
Yes, we all know that, John.
I realised that, but I didn't think that it was an error on his part in the sense that you mean. The fact that he was proposing to wire the circuit as a radial (and was simply asking whether that was 'OK') implies that he understood that it would 'work', with an electrical return path via the neutral, so I assumed that he was simply asking whether it was acceptable for the cable not to return to the CU (to 'complete a ring circuit').
As above, although I may be wrong, I didn't think that there was any error to correct in relation to the electrical 'return path'. I thought that he used "go on and complete a circuit" to mean '... create a ring' (which, by implication, he didn't seem to think was electrically necessary, since he was proposing a radial), so there was not really any error to correct, merely a need for confirmation (which Rocky provided) that it was acceptable for the circuit not to be a ring.
I'm sure he can (and will) speak for himself, but I doubt that he disagrees witg that aspect of the vregs.
It's a pretty big jump from "not necessary" (with which I would agree in nearly all cases) to "should not be done". There's an almost unlimited list of examples one could cite in which such a jump would be inappropriate.
Well, that's true.
And so, it seems, is that:
Oh, so I can just run the existing 1.5 twin & earth to the dimmer, but wire the lights with twin 1mm & earth.
Only really in terms of 'intellectual tidiness' - there is clearly nothing electrically wrong with it.
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