Black replaced yellow and grey replaced blue
Cables should be oversleeved with the colours of what you use them for, if you need a neutral its normal to use the grey and sleeve it blue, black is quitre often used for switched live, or in SWA, earth (of course sleeved correctly for what you do with it)
Oh, and I notice you mentioned utility room, it would be wise to consider closely what you need in there, it is certainly a nice touch to have a tumble dryer on its own circuit, or if you want to go really OOT have a separate circuit for each appliance
Cables should be oversleeved with the colours of what you use them for, if you need a neutral its normal to use the grey and sleeve it blue, black is quitre often used for switched live, or in SWA, earth (of course sleeved correctly for what you do with it)
Oh, and I notice you mentioned utility room, it would be wise to consider closely what you need in there, it is certainly a nice touch to have a tumble dryer on its own circuit, or if you want to go really OOT have a separate circuit for each appliance