Well, I guess we simply await more news from TVOC. As some people know, I've started work on a new Vulcan book which will be more than double the size of the last one I wrote, and I will be including a very substatntial section on XH558 even without the assistance of TVOC. Certainly, if they still want to maintain their aurua of secrecy then they're welcome to do so, but I certainly don't propose to avoid telling 558's story as it is, "warts n all".
If Pleming and co. continue to say nothing, then I will of course seek further information from the Lottery people, as I'm sure they will be rather more forthcoming!