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got a roof we're doing, 45deg pitch, covered in slate(0.35 kN/m²) I've got 225x47(9x2) joists as a clear span. I was going for 400mm centres, would 450mm still pass regs? I'll double the rafters at velux windows. any thoughts/opinions?

I've a 10mm 4 core SWA cable that feeds my garage. I'm going to get a new 3 phase supply put in. If this becomes the cable to feed my house(10mm 4 core), can I use the '4th' core to increase the CCC of the cable? Ie,10mm CSA effectively becomes 20mm CSA on the live? I'd guess if possible...