From now until the end of September, Sky is offering discounts to existing customers wanting to upgrade to its HD service. While the box remains £299, customers can get it for as little as £199, depending on how long they've been signed up for Sky.

If you've been with Sky for up to three years, you get £20 off the box, making it £279; three to six years gets you a £50 discount, and those with Sky for over six years get the box for £199. In each case you also get reduced-price installation, at £30, and the chance to go multiroom with your current Sky box for £10 extra a month.

To find out how much of a discount you can get, have your account or viewing card number ready, and click here.

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