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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.
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ColinTheBald
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That again pushes it to the levels of skill that I'd not be comfortable to do myself. At least not having the confidence to look anywhere half decent. I'll try taking some photos of other solutions along the brook so you can see my competition. And I use that term very loosely, some of it is shocking, but clearly hasn't fallen in, yet.