For anyone interested, the 4.1.2 Portuguese official firmware works great when flashed over the top of one of the previous JB leaks.
Sure the UK release will be out soon, but we were tired of waiting for the gf's phone. Gingerbread is just too damn old, its disappointing that its taken so long to get a proper official ICS/JB release.
Worth doing the update, easy enough and performance is good. All the Portuguese network branding is removable, has the normal Samsung bloat though... Stock camera finally has zoom...

GF still hates it, and I can't say I'm a fan of the Ace2 from what I've seen, still... Updates are updates.