The Siege of Mersadie Hive was a custom scenario lovingly crafted by Arthur. As such, unless your GM is planning to borrow the scenario by hacking together what they hear on this episode and the notes on Arthur's blog, there's really no spoilers to worry about.
As always, be aware that the podcast is not really family-friendly, and features some background noise, if that sort of thing bothers you.
It just occurred to me that my habit of putting links at the very bottom of the post is unfriendly to those who dislike spoilers. Sorry! I've moved this one and will try to remember in future.
For more information on this and the remaining episodes, see Arthur's notes.
This episode offered more tactical goodness (with some tricky decisions) as well as juggling the conflicting demands of at least two problem situations - one immediate and serious, the other tentative, uncertain but potentially catastrophic.* I felt like we made the most interesting call here, and one justified by the circumstances. Marines would be keen to avert an internal disaster, but the orks were a known and obvious threat needing to be dealt with, more in line with their expertise than confronting possible corruption, and less liable to cause political complications. Allowing the situation to brew somewhat also left us with, I think, a more interesting set of encounters all round than we might have had by just blowing the top ten levels off the damn hive already - although I suppose a hive breach while we were distracted would also have been rich fodder.
*For those not entirely up on the Warhams setting, this aristocrats business was starting to look like a cult. Chaos cults are bad, in the way that reality-shredding rifts summoning endless hordes of mankind's worst fears incarnate to slaughter the entire populace of a world in a vast sacrifice that draws the favour of appalling powers and dooms the world to eternally languish in the neverspace of a nightmarish other-realm of ever-shifting and dreadful reality beneath the laughter of the thirsting gods is bad. In exactly that way.