How much the BBC costs per channel, and per hour of broadcast

Wouldn't it be nice to also see the numbers for the Sky (Murdoch-owned/controlled) channels?

This line interested me greatly:

But because TV reaches a much larger audience [..] when considered on a ‘cost per viewer’ basis, its greater expense is not quite so pronounced.

Is this an assumption they're making? Is using the TV to reach out to people cheaper than the radio? The reverse holds true for India (All-India Radio reaches way more people than Doordarshan (state-sponsored TV channels)), but that's a different situation - radios and radio coverage across India is dramatically cheaper than that of television, and radio advertising is orders of magnitude cheaper than on the telly.

Interesting, it looks like I'm just about using up the cost of my license fee by listening to Radio 4 or Radio 7 constantly:

365 * 16 = 5840 hrs/year, 5840 * 2.5 pence = GBP 146.00

(BBC Licence Fee 2009 is GBP 142.50)