Thanks all.
I also thought re oven height that worktop height for the bottom one was standard? I don't like the idea of lifting things out from above eye level (I'm 5'7) but yes, it could definitely move up a bit.
Agree about the larder/F/F height.
We've been through the issue of how things will open with the designer and there is a solution - I just can't remember what it is right now 
Plan for the open shelves is they'll have things on them that are seldom used but look nice, eg pestle and mortar
The coffee machine will live on the counter under the open shelves.
The dishwasher will be to the left of the sink, so directly next to the tall
shallow unit where majority of plates/glasses etc will live. We must check that the DW and cupboard doors will be able to be open at the same time though.
The tall cupboard to the right of the sink is there because the boiler is there. Alternative would be having a wall cupboard over the boiler, but I think this actually creates more useful space.
I'm not worried about light because there will be a massive fuck-off roof light in above the left hand side of the island.
I definitely don't want the sink on the island. My rationale is that one spends more time cooking and chopping, and therefore want to do that facing the room. We don't have DC so not worried about pans being pulled off it.