Broadback wrote:

I am looking for a concrete that contains small size "stones". Is there
such a thing? fine concrete is a different thing altogether I have found.

Get a bag of "grano to dust" from you local builders merchant and mix
your own

https://www.travisperkins.co.uk/bagged-sand-and-aggregates/travis-perkins-grano-dust-trade-pack-6mm/p/996251