Easement of Common Intention
There should be evidence of common intention of the parties but it may not be for the necessary enjoyment of the property.
The used is presumed to be within the intention but the rights necessary for that use have not been expressly granted in the grant of land.
There appears to be overlapped between the easement of necessity and easement of common intention.
There rights are impliedly incorporated into the agreement and enforceable as in Stafford v Les  and Wong v Beaumont Properties Trust Ltd .