Why in UK Parliament did they say "I refer the right honourable gentleman to the answer I gave a moment ago"?

And why don't they do it any more?
Update: I mean specifically, the phrase "I refer .. to the answer I gave a moment ago". This whole phrase used to be used a lot in Prime Minister's Questions. Talking about an answer that was given a moment ago seemed to be part of the weekly protocol that I never understood and can't seem to find an explanation on the... show more I mean specifically, the phrase "I refer .. to the answer I gave a moment ago". This whole phrase used to be used a lot in Prime Minister's Questions. Talking about an answer that was given a moment ago seemed to be part of the weekly protocol that I never understood and can't seem to find an explanation on the internet.
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