If this is what your arguement is based on it is seriously flawed.
You've misunderstood what's meant by the statement in 3 (a) (i).
What it's saying is if a replacement meter is not to be installed and the Service valve, or ECV which we've agreed acts as a service valve, does NOT control the supply to ANOTHER PRIMARY METER ( eg a single supply to a property with multiple Primary meters like a block of flats) then the ECV / Service valve can be capped and the supply can later be disconnected in the street.
If it does supply multiple Primary meters, which would mean multiple bill payers, then it cannot be capped and cannot later be disconnected in the street.
You're reading it as where there is an ECV in place, which is what you had, it cannot be capped and later disconnected.
That's not what it says.