I really enjoyed that episode! It got off to a shaky start with the overlong song from LB, but it got much better.
I love that Wowbagger is back, as he was always one of my favourite recurring characters. Of course, in series 5 we hear him being vanquished by Zarquon at the restaurant at the end of the universe, which I always liked as an ending for him. Perhaps, though, the Thor attempt will fail and that is what will happen to him eventually. That version of events was technically part of the fake reality created by the Bird, so it doesn't matter if he does die in this series; I'd just quite like for the old version to remain a possibility.
The thing I'm happiest about is Fenchurch. I was just thinking about how I really hope Fenchurch will return when Arthur said he needed her. I literally said "yes, you do" aloud without thinking about it. I was alone. And then Jane Horrocks played the computer as her later on, which just fills me with even more hope! At least I know now that, if she does come back, Jane Horrocks will definitely have been available to play her.
This is all very exciting! This is the only chance I'll ever have to experience The Hitchhiker's Guide to the Galaxy as it comes out (though I've not yet listened to one live). I'm looking forward to seeing where this is going!