Poorly Retro-fitted DPC, Best Way to Make Good?

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Hi all,

Just investigating the rising damp issue in the original part of our house (built pre 1900). We could see that a DPC had been retro-fitted at some point, but this obviously hadn't fixed the issue. After removing a brick (see attached image) it appears the DPM only just cover the base of the bricks and there is a circa 25mm gap between which is where moisture is still being allowed to wick up (I've cleaned out all of the mortar that was in there).

What is going to be the best course of action to repair this? Just inject a chemical DPC? Electronic DPC (electrical osmosis)? Or the pain staking task of removing every other brick and inserting more DPM to fully cover the gap? Or other?

Thanks in advance
 

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