You can cancel the multiroom, how easy it would be is difficult to say.
All paid fore sky channels would be blocked but your standard sky box should be able to receive most of the free view channels if not all.
If sky completely cancel the card you may have to get a free view card so you can view channel 5 and one or two other channels.
You shouldn't need to buy a freesat box unless you want the HD channels or your sky box needs replacing.
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