@Buzyizzy
Dish ownership transfers to the subscriber at installation and passes to subsequent occupants: it's up to you to decide if and how to remove it (but Sky won't do so). Safety assessment is also up to you: if there's no live Sky box at the other end then the coaxial cable isn't carrying any current*.
*unless it's actually a two way data satellite dish rather than satellite TV, in which case there could be a mains connection. Always safest to assume any cable is 'live' if considering cutting it.
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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
