As far as delivery goes I received mine in a few days, Oct 20, my daughter’s took 10 days in Dec 20, and as you point out the brexit issue has a number of issues due to taxing etc.
Check out UK sales in post 10 of the above.
Other than that support, according to some reports on this user forum is very slow relative to expectations and sometimes z z z z 
EDIT 1 My daughter had to wait 5 days longer than was initially stated.