From their site
Sky Broadband in Sky Network Area: Maximum home download speeds up to 17Mbps. Existing customer set-up £60 for Lite or free for Unlimited. Monthly usage caps: Lite - 2GB. Maximum upload speed: Lite and Unlimited –1.3Mb.
Sky Broadband outside Network area: Connect is available at £17pm with no monthly usage cap (£30 set-up for existing Sky TV customers & customers without Sky TV). Maximum home download speeds up to 6Mbps. Connect subject to a Network Management Policy.
Sky Fibre, Sky Fibre Unlimited & Unlimited Pro: Availability subject to location and survey. £30 Sky Fibre Unlimited and Sky Fibre activation. Maximum home download speeds: Sky Fibre and Sky Fibre Unlimited - up to 38Mb; Sky Fibre Unlimited Pro - up to 76Mb. Speeds vary by location. Sky Fibre monthly usage – 25GB.
Sky WiFi: For Sky Broadband Unlimited/Connect/Sky Fibre/Sky Fibre Unlimited & Unlimited Pro customers. Available on 6 registered devices. Experience varies by location and number of users. App requires iOS 6.0 or later (Apple devices) or compatible Android devices running OS 2.2.2 and later or 4.x.
30 day Broadband and Talk Satisfaction Guarantee: Available within the first 30 days of all your services being activated. Refund applies to subscription charges only (not set-up charges or non-inclusive call charges) and is pro-rated. Statutory rights are not affected. Not applicable if you change your package.
Best ever Fibre offer: Comparing monthly fibre and line rental providers on a 12 month contract. Excludes prepaid cards. Features vary between providers. For verification go to www.sky.com/skyfibre
Sky Broadband general: £6.95 router delivery charge. Speeds vary significantly by location. 12 month minimum subscriptions. New 12 month minimum subscriptions for Sky Fibre Unlimited Pro + Sky Talk & Line Rental. Separate contracts apply to Sky TV, Sky Broadband/Fibre and Sky Talk. No traffic management policy for Sky Broadband Unlimited, Sky Fibre and Sky Fibre Unlimited in the home. External factors such as internet congestion can affect speed. See sky.com/shop/terms-conditions/broadband for more details and our Usage Policies. MAC users receive 12 months free McAfee VirusScan worth £19.99. McAfee Free Trial: Sky Broadband Lite-3 months; Unlimited, Sky Fibre and Sky Fibre Unlimited & Unlimited Pro -12 months, then £3 pm unless you contact us to unsubscribe.
Sky Hub: Inclusive for new Sky Broadband customers. £69 for existing Sky Broadband customers. £6.95 router delivery charge applies. Range may be affected home environment.
Fastest peak time speeds: delivered by Sky, BT, Plusnet & EE (Nov 2014). Ofcom excludes Wi-Fi performance, which varies by device, home environment & ISP.
Best combined overall customer service for Broadband and Talk: adding together customer service satisfaction levels for broadband and landline services.
Sky subscribes to Ofcom's Voluntary Code of Practice on broadband speeds.