It's under User Settings - User Preference - Auto Time Shift Mode (and off by default)
Spent about 30 seconds playing with it and switching it on starts recording the current channel. Not sure how long it holds.
gwf: Sounds to me like you have a defective machine. Mine has never demonstrated the behaviour you describe.
ADKM: The EPG button does nothing, or is very slow to diaplay "Loading..." and sometimes just says "Please Wait' (and you wait for ever). Is this a freeview problem ?