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stevo_com
hurricane_run
As it won't be seen above soil level it doesn't have to be pretty, besides, blocks never are.
You would need 36 blocks, a ton of concrete and half a dozen bags of sand, total cost approx £250. See picture below for how to lay them (note: yours is not high enough to need steel rod). I would tap the lowest course of the 3 into the foundations before the concrete went off, less mortar and stronger fix.
A grand should get it done if you are employing someone.