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Engineer54
I like the good engineers point, Its something we use regularily on the industrial side (may have something to do with the fact that 2 x175mm 4 cores are a bit easier to manoevre then a b*stard 400!)
On a side note many 6mm T+E shower installations on a 32A MCB or 30A fuse now do not comply as method 101 only rates the cable at 27A (over 4" of insulation in loft).
I'd be using 2 X 150mm cables in place of a single 400mm cable!! The easier install is just another benefit of using a parallel supply. As a cables CSA get's bigger, it is able to carry less current mm for mm in real terms. A parallel supply is not limited to just two cables either, ...you would probably have a pink fit and die in it if i tell you how many single core parallel i've used in main distribution supply runs!! lol!!
I'm sure you meant to say 185mm rather than the stated 175mm above?? lol!!