As you are talking about filling in the centre void, your piers must be going to be 327mm square or bigger.
If no gates are being hung then brick the void up with brickwork as you come up.
If hanging gates put cranked RE bar in founds finished 100mm lower than top of pier and fill void with concrete
Do not put poly DPC in. If you want a DPC use two course Staff Blues
oldun
If you are having one of those poxy concrete coping stones, then the centre can be left hollow. If you are having a proper brick on edge or similar then the centre needs to be solid
The simplest thing is to just lay the two bricks in the centre every course.
I agree with Old codger on this one regards strength.
We shove in some lengths of rebar into the wet footing concrete then brick up around the bars.
Then fill with wet conker the next day.
If it is simply a wall pillar then drop a couple of bricks in the centre. Make sure that the infill bricks are at least a course behind the outer decor bricks to avoid any push.
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