Yes if a standy mode is provided it has to be meaningful (actually less than 0.5W) but they do not have to make that standby mode compulsory
Sky-Q apparently has a 'none' option for standy mode selection. Sky-HDs allow you to opt for 'Eco', 'Active' or 'None' as standby modes and if you look up the EU regs they exclude networked equipment and equipment powered from a low power source (ie a separate PSU)
https://ec.europa.eu/energy/sites/ener/files/documents/Guidance%20document_Lot%2026_Networked%20Stan...
"Equipment placed on the market with a Low Voltage Power Supply is exempted, as long as it works as intended with a low voltage external power supply supplied with the equipment"
The network one requires a little more specmanship
"The power management should be activated as follows: When networked equipment is not providing a main function and other energy-using product(s) are not dependent on its functions, the power management shall switch equipment after the shortest possible period of time appropriate for the intended use of the equipment, automatically into a condition having networked standby. The function is similar to the power management for standby and off."
And we know that data connection and processing at all times is essential to the YV function so that it is aware of programme changes
The compulsory power standby function in YV and its predecessor BT Vision was all about posturing to look good to the Greenistas.
