So, now my post has been integrated here and unfortunately, my questions remain a little bit unanswered. If I see it correctly, only Timothy has practical knowledge with a TB20 and it may have cost him about 20k? Is this correct? If so, I will contact him directly :-)
It was me with the TB20 who got quoted 20k.
Timothy is long gone … and never had a TB20 AFAIK.
The key Q is what does this give you / what are you looking for? For 20k you need to be getting some massive benefit. I could not see a benefit, unless it was something pretty specific and which nobody was willing to talk about. I suggest contacting the SM registry for their view, and post it here if you get a reply 
