Thanks for the answer. Yeah, I like what Big Finish are doing with the DS range. I've only listened to the full cast audios and dramatic readings as far as the Doll House. I like the fact that BF use both writers who are familiar with the show and ones who have never seen it. It allows for a greater variety and also injects fresh ideas and a more out-of-the box approach to the story arcs of established characters.
I'm also impressed by BF's reluctance to recast. When they do there is generally a logical explanation within the narrative (such as with Andrew Collins as Barnabas in 'The House of Despair') or there is a decent age different from when the character appeared on the show (David, Amy, etc.).
And on top of that, they're exceptionally produced and maintain good continuity with the show. Yeah, I'm a fan.