@Mr+w+pearse
As @Mark39 indicates, at the end of last month Sky withdrew the ability to pair an existing card with a Sky+ HD box that didn't come directly from them. Unfortunately this may extend to second-hand boxes which have been working successfully for years but require re-pairing for some other reason.
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Sky Glass 55" (on ethernet) & two Stream Pucks (one ethernet / one WiFi)
BT Halo 3+ Ultrafast FTTP (500Mbs), BT Smart Hub 2
