Broken crockery, rubble & topsoil (Wallasey CH45)

Hi I hope to plant a courgette in this pot.
The pot needs about 30cm depth of earth etc. its widest diameter is about 50cm.
I need to fill the bottom of the pot with broken crockery etc. for drainage before topping up with compost that I already have. Can anyone help?
Can you help with this request?
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