This makes zero sense. Even if you choose very specific items that can be grown in a constrained environment it's going to cost too much to run.
Grocery stores make next to no margin on their sales - by adopting this they will have to charge more than their competitors. Which means they won't get sales.
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EDIT On top of this, there is not the physical space to do this at the scale you need. Do you know how often shelves are restocked, especially in the UK where stores are tiny? How are you going to fit your equipment in such a constrained environment.
Grocery stores make next to no margin on their sales - by adopting this they will have to charge more than their competitors. Which means they won't get sales.
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EDIT On top of this, there is not the physical space to do this at the scale you need. Do you know how often shelves are restocked, especially in the UK where stores are tiny? How are you going to fit your equipment in such a constrained environment.