As for STD's temporary closure and "Or does Stuart just like to announce his holidays in the most dramatic way possible?"
Interesting fact is that STD was the first company to mention this license issue implicitely by stating that they won't deliver the A6 and A75 for some time due to some third party dispute - I don't know what Castle wrote to the AMS but they did want to keep this more quiet. Now they're again the first to issue some statement again. So it can well be that they want to force some issue.
Well, perhaps they just want to "tickle" Castle a bit. I would think them to need a quick resolution of the license issue since AFAIK they need Adjust for the A75 (AFAIK RISC OS 4 classic won't help them and RISC OS 5 might have the "wrong" USB stack and might not be happy on the ARM7500 to start with). As for the A6 or other virtualised Acorns I think the early RISC OS 4 should do the trick. But no flames, please - it's just a wild guess.