The majority of people pay only the licence fee, £135.50. But those who choose to pay a subscription will pay up to about £45 a month on top of that. The subscription packages start at around £10 or £12 a month and go from there to £45 a month. If you are a sports fan and you want all the movie channels, then you are paying £40-something. If you want fewer channels and you don't want the premium sports channels, you are paying more like £15 or £16.
Of course the situation is somewhat complicated by the fact that now both satellite and cable operators include broadband access in their subscriptions. So as well as getting television, in most cases you are getting broadband and very often a telephone service too. So it is quite difficult to draw out all these costs to say this is the cost of watching television. But for the majority of people the cost is very simply the licence fee and nothing more.