Q 1. Input is Freeview via antenna.
Q2. Device connected via SCART is a hard disc recorder. The problem occurs whether or not this is connected. So the answer to your question is 'Yes'. The antenna is 'looped through' the recorder the to the TV.
Q3. There is no Menu button on the TV, but the ON/Off, Volume and Channel buttons on the TV do not work when the 'Freeze' has occurred.
Sorry for the delay in answering; I usually look at email only once or twice a day on a desktop PC.