Dave on Freeview?

I've just tried to watch Dave on Freeview Ch19 both via my TV and my DVD recorder, I get the description of the program and it's shown in the listings page etc. but I get a message about "conditional access" via the DVD and "CI card for conditional access" via the TV ???

Could this be anything to do with my local station (Sandy Heath) and the digital switch over? I'm due to do the last retune 23/11/11