Do you have any sources for how the interview took place? And any indication that it was unfair? (I'm pretty sure Sweden would have refused to do it if they were unhappy with the process.)
I don't know who asked the questions, or what the procedure was, but I read the Swedish prosecutor's statement issued today and they do not mention the London interview being an issue.
Thanks. Your original comment took issue with the statement that Assange was indeed interviewed in London by Swedish prosecutors. You said "This is simply not true." The issue for you seems to be that that the questions being put to Assange weren't actually put to him by Swedish prosecutors directly. Even though they were the Swedish prosecutors' questions being put to him. That doesn't sound like a huge issue to me, and I don't see why it should discount the interview. Especially as the Swedish prosecutors themselves have not taken issue with this aspect of the interview. It seems this was procedure they agreed to.
I don't know who asked the questions, or what the procedure was, but I read the Swedish prosecutor's statement issued today and they do not mention the London interview being an issue.