LTN 1/89, "Making way for cyclists":
LTN 2/08, "Cycle Infrastructure Design":
As a result of concerns over the safety of parallel cycle tracks crossing side roads, it is becoming common European practice to reintroduce cyclists to the main road in advance of a junction. Cyclists pass the junction on the carriageway and then rejoin the cycle track.
Those "advisory crossings" that it references, by the way: