No O-D, the rules haven't changed - see AP 1358. The only possible (if very unlikely) circumstance that could put a QCVSA ahead of ribbons is if the ribbons were foreign - and of course ALL foreign awards come after all Brit ones.
I'll try and find a link to the rules - I think they are
internet rather than
intranet
Edited to add:
Found it! Annexes E & F of Chapter 8 of 1358, which is
here
You need to scroll almost to the end of a long-ish pdf.