Stevecc,
Thats great, cracking on with it. In fact, if possible can you break the slate that crosses the cavity.
Difficult maybe without smashing the slate DPC but its the best thing to do now the bridging debris is being removed.
I had thought of breaking the slate between the wall tell80. The advantages of the slate between the walls is that it blocks any mositure from the foundations, the disadvantages is a little sand and mortar and its bridged easily. I think breaking it would be a bit difficult and risk damage to the brick/slate DPC also
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