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As there are now so few fittings compared to my first proposal, I downgraded the third smaller circuit, which was only ever for dim overall lighting when popping in to get something. But I'll do as you suggest and change a few. See below ...that looks better to me, but should be more on red circuit, less on yellow and blue. and i would opt for 10A C curve MCBs on all 3.
If I reduce the number of either 'yellow' or 'blue' panels in the new reduced design too much, there won't be enough left to be used alone to light the whole room, when high intensity task lighting is not needed. Hence the odd unbalanced design.
There's a further complexity which I didn't mention: the L2 circuit has a 'security lighting' relay across the switch. This is standard throughout all the buildings, all of which are interconnected with a 25-pr data cable, one pair of which carries +24Vdc from the alarm panel in case of an alarm activation. (Via a Texecom relay output). The effect is to blast every building, and a lot of the grounds, in light in case of an alarm, or if any panic button is pressed. So I need to be sure the L2 circuit has enough lights to frighten off, and to get a clear CCTv picture of any low life who breaks in thinking he'll find a quad bike to nick.
There's also the consideration that, for historic reasons, L1 and L2 have a solar supply, but L3 is paid-for only! This was all too much detail for my original questions.
And there's a technical reason why I want to at least try a 6A B-curve MCB first: I have a spare one in my box! ? If it trips, I'll do as you suggest and buy a new 10A.