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That was a fairly regular occurrence for lots of late edit programmes and routine for sports highlights. In fact it wasn't unknown to start playing the first bit of a programme while they were still editing the rest of it. You had to hope they finished before the first tape had run out. Only when you were into the second tape did you know how long the programme was going to be.
As mentioned here a number times, apparently the edit were still rewinding the tape as the balloon symbol was on air introducing the programme!
That was a fairly regular occurrence for lots of late edit programmes and routine for sports highlights. In fact it wasn't unknown to start playing the first bit of a programme while they were still editing the rest of it. You had to hope they finished before the first tape had run out. Only when you were into the second tape did you know how long the programme was going to be.