The BBC & the CBC produce a lot of dramatic radio with full casts & music & sound effects, but not all that much science fiction - see BBC Radio 4 Extra, for ex

The BBC & the CBC produce a lot of dramatic radio with full casts & music & sound effects, but not all that much science fiction - see BBC Radio 4 Extra, for example. CBC’s Vanishing Point is the most recent dedicated speculative fiction show I’m aware of with that level of production values.