Ok, I found the 7K6000 on the MoreComputers website on 17th July. It wasn't in stock so I clicked the 'Notify me' button. I was emailed to say stock was expected 27th July. It didn't arrive. Then stock was expected 17th August. It didn't arrive. The next date was the 14th September. It didn't arrive. The latest date is 5th October. If it arrives by that date I will probably fall off my chair with the shock.
The Nigel O'Hara website will order a drive 'upon request'. Call be cynical, but I think that order might go the same way as my MoreComputers query.
There is an issue here, or at least, in the UK there is. Yes, Span will order the drive 'upon request' but only for a batch of 20 or more. I could order from Amazon via Germany for £225.83 ($346) including delivery, but that's too costly for any 2TB drive.
It's just as well getting this particular drive isn't important, if it were I might be getting rather annoyed.