Extending a lighting circuit

I'm extending a lighting circuit to add a couple of wall lights on the 1st floor. I've got the cables laid from the loft down to the back boxes for the switches and outlets for the lights, and now I need to connect the new circuit to the existing lighting circuit.
Is it acceptable to spur off the existing lighting circuit at the most convenient point, or are there rules to follow when deciding where to spur from?
Most of the diagrams that explain how to add a lighting circuit show it coming from the last junction box / ceiling rose in the circuit. I don't know where the end of my lighting circuit is, and sods law would ensure that it's a long way away from where I want it. I don't want to be drilling or notching joists if I can avoid it.
My plan is to cut a permanent live cable close to where the new lights will be and install a junction box at that point to connect the spur. I'm not sure of the exact topology of the wiring in the loft, but I'm hoping it doesn't matter.
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On 24/03/2020 18:23, Caecilius wrote:

Yup, although the circuit type is called a "radial" - you should not take the term too literally. It doe snot all need to be a single chain, and its perfectly acceptable to have branches as and where required.

When wiring a new circuit that is often the easiest way to do it, and also keeps the number of cables entering each JB / rose etc down. However for extending, go with what ever works best for you.
--
Cheers,

John.
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I just branched off the most convenient point in the circuit but as I was r eplacing the total lighting circuit at the time the junction box ended up a s part of the daisy chain. I did however fit a FCU in the loft just to be a ble to isolate the wall lights from the rest. We only switch the wall light s on/off using switches on the fittings so no wall switch.
Richard
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On Tue, 24 Mar 2020 18:54:28 +0000, John Rumm

Thanks. It's useful to get confirmation, as real-world experience often differs from the neat and tidy diagrams.
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