HD packages. Do I need them both?

[KK5420]

 

I am currently paying for Sky HD and Ultra HD packages. 

Do I need to be paying for both of these? 

What's the difference?

I'm so confused and it's costing more. I don't know what will happen or if I should cancel them. 

Any help would be greatly appreciated. 
TIA

[Daniel0210]

@KK5420 

You can't subscribe to the UHD add on without first having the HD package. 

[Doc5907]

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@KK5420 wrote:

Do I need to be paying for both of these? 

@KK5420 

That depends on the picture quality you wish to watch in. If, like my sister, you can't really tell HD from SD (due to her eyesight ) then you can do away with HD (and subsequently UHD).

Likewise, if you only have a HD TV then there's little point in adding the UHD add on.