I’d definitely recommend the older BBC Audio ones, they’re great for filling in that gap of Jack/Gwen/Ianto stories
- Lost Souls gives a great look into the team’s feelings post-Exit Wounds, and has Martha in it too!
- Asylum is pretty solid for Andy’s characterisation, and has him finally really learning about Torchwood (pre-Season 3 where he seems to have a better idea)
- Golden Age Gives a bit more history of Torchwood, featuring Torchwood India (and is written by James Goss who’s always great)
- The Dead Line is a pretty solid feel for what a ‘standard’ season 2.5 story would’ve been imo
And then the three BBC Audios they dubbed ‘The Lost Files’
- The Devil and Miss Carew is another solid ‘standard’ season 2.5 story imo
- Submission gives us some backstory and great characterisation for Ianto
- House of the Dead is a James Goss script, a 10/10 and favourite for me on the guide, and does some brilliant character stuff for Jack and Ianto, though much better going in without knowing much.