As an existing customer I'm quite interested in this, the Free version isn't great (but better than my current dial-up situation) but I think the other ones work out quite cheap:
BBC: Free Broadband From Sky
SKY BROADBAND PACKAGES (Installtion is optional and you get a wireless modem/router)
Base - 2Mb download speed, £40 connection fee, £50 installation, free subscription, 2GB monthly limit
Mid - 8Mb, £20 connection, £50 installation, £5 monthly subscription, 40GB usage
Max- 16Mb, free installation and connection, £10 monthly subscription, unlimited usage
Connect - 8Mb, £40 connection, £50 installation, £17 a month, 40GB usage
BBC: Free Broadband From Sky
SKY BROADBAND PACKAGES (Installtion is optional and you get a wireless modem/router)
Base - 2Mb download speed, £40 connection fee, £50 installation, free subscription, 2GB monthly limit
Mid - 8Mb, £20 connection, £50 installation, £5 monthly subscription, 40GB usage
Max- 16Mb, free installation and connection, £10 monthly subscription, unlimited usage
Connect - 8Mb, £40 connection, £50 installation, £17 a month, 40GB usage