The reference to blue on the ordnance survey map is not relevant.
It is what is in the land registry and council records which is relevant.
The local authority cannot do anything on private land unless they compulsory purchase order.with the consent of the owner. If they do, then it is trespass.
Can I clarify anything else for you?
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They are indeed.
The local authority will not normally adopt an area until it is up to their adoptive standard but once it’s adopted, they are responsible for maintaining it.