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Polygon
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It is hard to tell from that perspective. This is the type you need, narrowing slightly to the front of the blade. Note: it is worth periodically sharpening the cutting edge with an angle grinder and metal cutting blade held at an oblique angle to the top of the blade. Don't sharpen from the underside.
ColinTheBald
A rake isn't the tool for the job, you need a proper builders digging shovel, NOT a loading shovel. The blade will be angled correctly for you to skim the base flat. Any builders merchant will stock them. If there are lumps that have to be prised out a mattock would help, Screwfix ones are good and cheap.