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It can't be difficult, I can do it. If I remember right, you're looking at 60cm, in which case 2 blocks high by 2 blocks wide with a brick capping won't be far off (see below but blocks not bricks to front). Ideally, lay your foundation 2" overwidth and about 4" deep and dead flat. Alternatively, if you follow the ground level, cut bottom blocks to angle of foundation with a grinder and diamond blade, top of the bottom course must be level.
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ColinTheBald
I meant sheet behind a waterproof membrane but I get your point. I'm pretty practical but have never tackled bricklaying, so this seems like a good project to give it a go on seeing as it'll be hidden!