Extending Cable on a Ceiling Light

[MisterFish]

I'm dropping the level of a ceiling in my pantry. Its only coming down by a few inches but the cable through the ceiling to the rose, (and into the ceiling pull switch for the light), is "just and no more" long enough to wire into the rose where it is.

I need to extend everything by a few inches. Is there a preferred way to do this or should I just get a length of terminal block and extend the wires that way?

Any advice gratefully received.

 

[EFLImpudence]

If the joint will be accessible:
https://www.tlc-direct.co.uk/Products/ASJ501.html

If it will not be accessible (or even if it is):
https://www.tlc-direct.co.uk/Products/ASJ804.html


or any similar product.

 

[MisterFish]

Thanks very much.