to let the Beeb know that there's fans out there that really do want this stuff.

Oooh, I like that reasoning! Very world economical of you. Yes, yes, in order to support the global economy and to raise the awareness of the feasibility of releasing OST of television drama, we should support by means of purchase. Oh, far better than my old reasoning: listen to the soundtracks to inspire fanfic. Has that worked? Noooo.