One 20 kg bag of Blue Circle multi-purpose concrete will typically produce around 0.01 m3 of fresh concrete (0.33m x 0.33m x 0.1m).
(According to the datasheet, https://tarmac-bluecircle.co.uk/multi-purpose-concrete/)
You need 3x4x0.075 which I make 1.01m3 or 101 bags.
Ah - I misread concrete as cement. 15 bags of cement + all the sand + all the aggregate so only half answered your question
I would also get it piped in if it’s at all possible but it sounded like it is not.
@t.o. started
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t.o.
One 20 kg bag of Blue Circle multi-purpose concrete will typically produce around 0.01 m3 of fresh concrete (0.33m x 0.33m x 0.1m).
(According to the datasheet, https://tarmac-bluecircle.co.uk/multi-purpose-concrete/)
You need 3x4x0.075 which I make 1.01m3 or 101 bags.