Buried DPC

[Rwd1]

I am repointing a bungalow, circa 1960's. I have chased along each side of the dpc, (which looks like bitumen), but most of it has been pointed over solid and the remainder is in pretty bad shape - either very brittle with a raggedy edge, or already crumbled away.

My question is what is the best course of action for repointing, considering most of the outside edge of the dpc is between 5 to 25mm back from the face of the bricks?

I was planning on using a 3:1:1 or 4:1:1, but now wondering about using waterproofer in there also? It is going to be difficult to joint each side of the dpc as it is now.

[Gadget]

I've got to get my eyes tested, I could swear that your first line read- "I'm reporting a burglary", must be my age..