Garage - standard size for a garage in UK is 3m x 6m so check if this is big enough for your car or needs.
Study in hallway - messy and in the way of front door. Do you really want a pile of paperwork as you walk in or a desk chair to trip over.
Kitchen is too small. Where is the fridge and freezer fitting in? The layout has an oven and hob next to the doorway for the pantry.
Laundry is a bit small, but you can stack the wm and td.
Loo is also tight on space.
You will need to buy 7 sofas. Do you really need so much lounging space, 4 rooms. I'd lose some sofa areas to make the kitchen bigger.
There's no doorway to the garden. Sliding doors but no a traffic door.
Upstairs - none of the bedrooms are that big. For refence our main bedroom is 4m x 6 m plus a small walk in wardrobe and shower en suite and it doesn't feel enormous. 3m x 3m is a small double. Do you need walk in wardrobe for each room. ie is one a spare room.
I notice the main bedroom is overhanging at the front, there's a cost implication for this.
I'd lose the sitting area upstairs to make the bedroom bigger, lose the overhang/bumpout to reduce build costs. Perhaps add a small study upstairs with a door you can close off.
Have you discussed budget? Architects are notoriously out of touch with current build prices so it's worth having a chat to a builder to get an idea when you are still in the design stage. For instance the walk in wardrobes, the extra partitioning, plastering, decorating, doorway and doors, fitting the doors and handles etc, it all adds up.