tl;dr What does the law or highway code have to say about vehicles (specifically, delivery vehicles) stopping in and blocking a cycle track?
There was a DPD van blocking the hills road cycle track last week and I wrote to DPD informing them of this. They said they were going to make sure it didn't happen again and that the drivers would be informed of the rules. Today, the exact same van and driver were in the cycle track again.
So, before I go back to DPD, and for my own knowledge to use as suitable ammunition in a "discussion", what _are_ the rules around vehicles entering, stopping and parking on a cycle lane and/or track like those on Hills Road, as well as others?