Correct. The National Anthem was on a broadcast cart same as used in radio for jingles / commercials / announcements etc,, the delay was the announcer not bringing it in from the very start. The cart does go back to the start after it is played, there is a cue tone that the cart machine winds forward to (the tape is on a loop inside the cart), this cue tone at the start tells the machine to go back to the start once played (you can turn that off if you want to when recording to a broadcast cart so it plays in a constant loop continuously), and once BBC1 has faded to black and gone off air with the usual 440Hz off air tone, the announcer removes it from the broadcast cart machine and puts it back in the cart rack before packing up and going home last thing at night. The continuity was done from a small room at Television Centre which contained a mixing desk, colour monitors, two Technics turntables,broadcast cart machines, reel to reel tape deck, cassette deck and a microphone.
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