Since we don't know where you live, it's hard to comment on the item from Worthing
However, I do know from much correspondence with the chief exec's office of the Royal Mail that some bits of the country are better served than others
If you want to know which, I suggest you delve into the full particulars of Amazon's delivery service and especially if your post code can receive express service
I know that I can regularly get next day delivery from Cable Universe (in Devon?) here in the Scottish Borders if I order by about 3pm
But stuff that comes via London may take much longer even when marked "time sensitive First Class"