I'm sure most/all of you already know but just in case FYI http://www.bbc.co.uk/mediacentre/latestnews/2013/new-hd-channels.html
As far as I am aware the current freeview+ spec states that for a receiver to stamp itself as freeview+ one of its features must be to be capable of flagging when an SD is also available in HD, but only where the broadcaster provides this information. I am not aware that terrestrial broadcasters who have a DTT broadcast licence have to offer that information in a suitable form.If the BBC send the information the HD Fox-T2 will offer the alternative. Usually the BBC are good at this, compared to the commercial broadcasters.
my experience with the commercial broadcasters is that often they fail to send the information and thus the alternative recording message will not appear.
If you are viewing a programme in standard definition or set a programme to record, and the same programme is available in High Definition you will be given the option to view or record in HD.
When setting a recording, the broadcaster may suggest a similar programme that you might want to record
Green Button (also known as Trailer Booking)
Allows you to schedule a programme to record during a trailer (or preview) of a programme without having to search through the programme Guide. A“Book me” prompt will appear on screen and when the green button is pressed you can set the programme to record.
Note: The above Freeview+ HD features are available on channels where the correct and accurate data is being broadcast. Some channels may not support all of the Freeview+ HD services.