I can confirm if hdcp handshake is terminated by powering off the TV then pause is released.
This does not happen with the other Humax boxes Like the Freesat boxes and the FVP 5000T models.
There is a way to avoid this on my LG C9 OLED. Holding down the TV remote microphone button and saying "Screen OFF" turns off the screen in 5 seconds. The box remains connected to the TV. Pressing 1 on the TV remote turns the screen back on instantly. I tend to do this when the BBC tell you to change channels to watch your local news.