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Your Solicitor is correct to challenge the partial completion certificate.
On the basis that the property was build complete in March 2015, the Building Control Department of the Council needs to issue a final Completion Certificate (a full one, not a partial one). WHenever a proeprty on a Development is complete, the Council will issue such a Certificate, and just because other Plots may not have been completed does not prevent them from issuing a "full" Completion Certificate- this is because a Completion Certificate is personal to each property and each property has to be inspected individually and then a final Completion Certificate can be issued.
I really don't know why, therefore,
only a partial Certificate has been issued- I can only assume that there must be something outstanding relating to the property itself- possibly the drainage for example.
Whatever it is, your Solicitor is correct in insisting on a "full" Completion Certificate.
A quick call to Building Control department querying the partial certificate will solve the mystery!
I hope this assists and answers your question.