I took a quick pic of the DRLs on full and on dim
To make it easier with testing the fuse box/headlamp locations we soldered the end of the yellow wire and blue wire to give them a bit of strength; this made it easier to jam into the holes! It's much easier with two people, as one can be switching on/off the headlights and the other can change wire locations and watch the DRLs!
Once we'd identified the right pin on the headlamp loom (i.e. when the DRL dimmed upon activation of the headlight low beams) we paired the wire (where it comes out of the loom) to expose <5mm of copper. We then got another small piece of automotive wire (which we fitted with a female connector on one end) and wrapped that around the bare copper, soldered (optional!), and wrapped with electrical tape. The DRL wire (blue in my case) we fitted with a male connector and connected the two wires - this makes it easier to disconnect the wire if desired.