In answer to your question and thanks by the way for your info.
The containers are on agricultural land not on domestic hence outside the curtilage, owned by us.
I have seen that planning regard the concept of 'development’ as needing planning and therefore If one’s actions constitute ‘development’, planning permission will be required, unless specified exceptions apply.
Development’ is defined as either operational development or a material change of use of an area of land.
Operational development encompasses building, engineering, mining and other operations.
If the container is used in conjunction with the main use of the land, there is unlikely to be a material change of use.
So Operational development would be the main problem.
Would this be a fair statement?