Can you mark the doors and the way they open on the plan? Including the room door, shower enclosure doors and vanity unit doors/ drawers? Your bathroom supplier should have done a room plan to scale for you.
As far as I can tell, you only have 600 between your vanity unit and your shower, is that right ? That’s not a lot of space - it will be hard to open doors / drawers or to bend down. If you bend over the sink to wash your face , your bum will hit the shower glass. If you are tall / big / pregnant it will be worse.
You only have 150mm on each side of your WC, so will be quite difficult to get in to clean the outside of the shower enclosure .
Is your 520 wide radiator a towel radiator and how tall is it ?
I think that you have allowed enough space for your fittings but not enough space to actually use them comfortably. Id be tempted to use more compact fittings in a room this size.