Several leaves are wilted on my Acer pseudoplatanus 'Esk Sunset'

Hi @SLR2009 , actually it looks OK to me. Maybe better than ours here, ha! In the fall they pretty much just go brown and lose their leaves, and the buds look fine. So I'm guessing it's heading into dormancy normally.

 

@SLR2009 good evening, August is a bit early for them to turn, but 2020 does seem a strange one in the plant kingdom among other things.
My Esk sunset is just starting to show signs of Autumn now, but my weather has been fine tbh.
If you have experienced a hot dry July and August then what your tree is showing is the stress from this. But as Emery has said already the buds do look OK for next year.
My Brilliantissimum is and has looked the same as your Esk for the past 6 weeks or so but the buds look the same as your Esk and I don't forsee any problems for 2021.
So I agree with Emery, it's just going into early dormancy.