Mine has just arrived evening of 22nd (I’m in Singapore presently); applied 14th, scheduled to arrive 28th. My agent emailed them today and I sent a Facebook message and emailed (including email address, DOB, passport number, date of application and proposed date of entry and the usual “pleases” and “thank yous”), so it appears that that really does help.
My agent also said to make sure your PCR test says RT-PCR as they can apparently get funny.
Best of luck everyone.
AP