The corner to the left of the sink, under the high level cupboards looks a very difficult space to use the worktops - we have similar in our kitchen and ended up putting the microwave across the corner diagonally so that stuff didn't accumulate in the corner. However our sink has the draining bit on the other side and is one unit further over so that there's space next to the microwave to put things down. I definitely think the sink and draining board need to be flipped around - and maybe moved along one - I think it will be incredibly annoying standing right in the corner to do anything.
I've just realised that you are going to have a window over the washing machine but is there any way that you could stack it on top of/below the tumble drier? And even put them in the cupboards on the other side of the utility so that they get hidden and you can then do whatever you need on the other side - there would be space for a fridge freezer maybe?
Have you made a list of what you think you'd put into each cupboard and figured how it would map from what you have currently - is there enough space for everything you would have?
Make sure there are more than enough plugs - it's always really easy to run out of them. Consider having some sockets that have usb sockets built into them too - really handy for charging phones and tablets etc plus there's more and more things that charge from usb stuff (whether you're giving the satnav a quick charge, or a music player or some fairy lights or so much other stuff...).
Can you have the end unit by the door as one that has a curve or angle on? Opens up the space, makes the room flow better, no nasty corner to hit yourself on, especially if lots of people are coming in or out together. Will you need anywhere to put outside stuff by this door?
Will you need anywhere to sit down in the kitchen? Even just a bench to perch at? Instead of cutting the corner off where the door is could you have the work surface come round a little so that you have a mini island sticking out? Even if there's just enough space for one stool beneath it, you might like having somewhere to sit and do stuff in the kitchen!
Have you thought about having any of those larder pull out multi drawer things? They can be great if you like having easy to access food storage. We had some once in a rented property and we really liked them - always said we would have them when we redid our own kitchen! You can also get 'hidden' drawers that go under the cupboards in the space that would usually just be behind the kickboards - useful for soaking up stuff that is either/or big, clunky, not used very often. Having lots of smaller cupboards reduces the amount of stuff you can put in them vs having the same number of cupboards in a longer run (assuming they are not built as individual cupboards). Have you thought about having deep drawers for pots and pans? Not sure if you have enough space but I'd want to know the kitchen designer's reasons for not putting them in as much as for putting them in. If they can't say why they put them in - or didn't - then they haven't put enough thought into it!
If it's just a small space, it's worth having a look at a few showrooms of 'nice' kitchen sellers - they often sell off their display kitchens for a knock down price and if you are going to have a simple layout without too much stuff you might find that if there is somewhere that has decent sized show kitchens, there is enough in them to get really nice units for your kitchen at a bargain price. There are also a couple of websites that sell show kitchens reasonably. Also means that you tend to get them with all the added extra storage bits and bobs that they've put in to show what they can do!