Then possibly join a 400 mm to whatever unit is next to it so that unit supports that side of the 400 mm unit. Remove the two now redundant legs of the 400 mm unit and move the legs on the adjacent unit by 200 mm to get a 600 mm gap.
Not sure what rating the hob is. It's a 4-heater induction hob, and the electrician is putting it on its own circuit).
It's a good idea to try it first under the larder unit - I'm assuming that it wouldn't work there, but it might. I'll do that.
As regards putting it under a 400mm unit and removing some legs: I did think of that, but one 400mm unit is at the end of a run and adjacent only to the WM; another is between the DW and the fridge; and the other is next to the sink but nothing else. The only reason I've got the 400mm units is because I wanted a standard base unit next to the DW and WM so I had somewhere relatively accessible to plug them in. The electrician was happy to use a standard single socket mounted on the inside of a 400mm unit, but I've asked for fused switches above the worktop, to operate an unswitched socket in the 400mm unit below.
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