I really enjoyed this one overall.  It's delightfully fun and The Trouble with Drax understands it is a bemusing heist story, which it plays into well.  Ray Brooks as Drax kind of steals the show here.  I certainly saw a few of the twists coming as we went along, as, after a while I could kind of see what writer John Dorney was going for, but I still thoroughly enjoyed every step of that journey.  I would absolutely recommend this one and it feels right on the level of a top-tier, "Doctor and Romana II with Douglas Adams as script supervisor era" Doctor Who story.  You can't do much better than that!