BBC One Breakdown
TV Home Forum - Major Technical fault before Panorama - Video on page 11
I believe both is the answer. As I understand it programmes are made available immediately after transmission by using the video segments encoded for the live stream, as also used by the live rewind...
BBC One Golf Breakdown, 23/05/09
TV Home Forum - Breakdown in golf coverage; News Channel simulcast
Analouge broadcasters Presentation
TV Home Forum - [Was:BBC and ITV Breakdown Captions] [See Pg. 8]
Obscure pres observations thread
TV Home Forum - p5 - C4 Breakdown 15/07/04
BBC One/BBC Two fallen off air: 15/12/09
TV Home Forum - 15/12/09 - 17:10 - BBC One and Two Off Air - Followed by Technical problems later in the evening...
Off Air Broadcast Feeds
Mass Media & Technology - Is there a way to access Off Air Feeds from UK Live Shows?
'LiveU' is encoded and controlled often by the 'lines rooms' / MCR - sometimes switching units to transmit - you won't ever get access to that and for good reason.
TTTV Text Off Air
TV Home Forum - All ITV Plc. text services have now ended.
BBC2 Breakdown
TV Home Forum - Down twice