S.I. No. 182/1997 - Road Traffic (Traffic and Parking) Regulations, 1997
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(3) All pedal cycles must be driven on a cycle track where one is provided.
Missing the importants bits.
14. (1) Where traffic sign numbers RUS 009 or RUS 009A and either RRM 022 or RRM 023 [cycle track] are provided, the part of road to which they relate shall be a cycle track.
And, the fact that the bus lane is indeed a bike lane... Its there in the fucking video, like!