Hi.
I'm afraid you may have been missold; NetflixUK is only available on a tiny smattering of devices, and it's hard to figure out which ones.
Usual stuff of make sure the network is connected (does iplayer work?), and try the firmware update option in the menu somewhere, but I fear you may get nowhere.
I see a pcadvisor review of your player, and it does indeed mention Netflix; alas it also mentions HuluPlus, rather suggesting the review was of an american model. And NetfilxUSA is somewhat more common on American players...
I'm afraid the only BD player I happen to know has NetflixUK is last years LG BD670. Believe you can get it on the PS3 as well.
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Regards, Iain.