Trust me, I live 9 miles away from Worcester in Worcestershire, no one says wOOster, that would be Bertie Wooster. (though southern English accents would likely use Wuster for that too).
The sound on the site is right, but that is Wuster.
It's like the difference between BOOster and BUster.
@yvanspijk
The must common American pronunciation I've heard for those that aren't familiar with the word try and say "WAHrcester" or something similar, and Worcestershire defeats them utterly.
That's "Wustershuh", naturally :-)