Here is today's update...
The sparky installed conduits and concrete was poured today. The hole is not as deep as I'd like - we hit some brickwork that probably covers the sewer line at just under 700mm below ground level. My builder dug out a flange so the concrete spreads a bit under the soil level and hopeully minimises movement. There is a layer of clay at around 300mm down.
Hope it all works and is stable!
Will bolt down the pier at the weekend and then finish off the electrical work next week
Pics to follow
Pete
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