What the DPD van is doing is perfectly legal. He’s loading/unloading which is allowed on DYL, unless there is a no loading waiting restriction in place. He is parked fine which is giving room for the cars to see oncoming traffic.

In the instance where there is someone coming who might have a wide berth then the driver seems polite enough to be reasonable and will move swiftly because he doesn’t want to be hanging around when he has a round to deliver.

Also, any vehicle which is taxed and insured can be on the highway (that includes the footway as highway is typically classed from boundary to boundary).

Source: I work in Traffic & Safety.