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Brendan,
My pier has 12mm thick walls, about 1.1m high, 200 x 200, and base plates at 20mm. Very heavy! I had it made, but you can get an idea of pre-fab design from bintel's site under "mounts".
I got extra height by building an above ground footing at about 800mm high and set bolts into the blockwork. Simply sat the pier on it.
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