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You can use the 1.5 and put a 6amp fuse in the plug until you get the secondary cu. RCD contention is a thing. You really only need one on a circuit and your kitchen circuit has one already so that's fine. If you fit a couple of 2 gang outlets where the CU will be then cable can be moved over when the cu is fitted.
Sometimes baffling are the considerations about earthing. I'm not going to risk describing any!
Thanks again!
The main reason I was going to use the different cabling for the different applications is I still have enough 1.5mm left from refitting the living room light. I would need to buy more for the sockets so was going to go 2.5mm for those. Plus, I would like to avoid someone in future expecting to see those types of cables and seeing something else or making assumptions. Plus, it will be converted to a "proper" installation in time. I won't be insulating before then so any glaring fuckups can be more easily remedied.
Likely load for sockets is going to be minimal, and what I have been using on extension leads anyway. Mitre saw, henry hoover, pillar drill, track saw, radio, battery chargers (and not all at the same time - I am not that dexterous).