None of the trades are going to plan the layout of your kitchen for you the way it sounds, so you will need to think about this.
It might be too late but I would consider not having cupboard on both walls as this will make your worktop space less useful and the kitchen feel more claustrophobic. Again it might be too late but I'd also consider not having a U shaped kitchen but two straight runs. corners in kitchen are a bit of a waste of space and you could get a bigger window (or door) at the end which would let light in and likely wouldn't hugely reduce your storage
As others have suggested plan your switches for appliances - draw this out where will micro, toaster, kettle etc go and then ad-hoc items. Think about how easy it will be to get to your services, so shut off valves on pipes which are easy to use. Where is the stopcock and can it be easily accessed. Where will dishwasher go. As you're ripping things out you may as well chase as much stuff into the walls or run it so you're not loosing cupboard space.
Think about what type of lighting you want. I'd suggest under cupboard lighting for your worktop and have that on a separate switch to your main spots, don't go crazy in a room that size.
None of the trades are going to plan the layout of your kitchen for you the way it sounds, so you will need to think about this.
It might be too late but I would consider not having cupboard on both walls as this will make your worktop space less useful and the kitchen feel more claustrophobic. Again it might be too late but I'd also consider not having a U shaped kitchen but two straight runs. corners in kitchen are a bit of a waste of space and you could get a bigger window (or door) at the end which would let light in and likely wouldn't hugely reduce your storage
As others have suggested plan your switches for appliances - draw this out where will micro, toaster, kettle etc go and then ad-hoc items. Think about how easy it will be to get to your services, so shut off valves on pipes which are easy to use. Where is the stopcock and can it be easily accessed. Where will dishwasher go. As you're ripping things out you may as well chase as much stuff into the walls or run it so you're not loosing cupboard space.
Think about what type of lighting you want. I'd suggest under cupboard lighting for your worktop and have that on a separate switch to your main spots, don't go crazy in a room that size.