Demolition is being used by the Archdiocese to try and demonise the enforcement process. Paraphrasing the situation, by my understanding, the building has to conform with the original plans, but there is the expectation they negotiate with Lewisham to vary details,which they have refused to do. The rules say that they have to conform with the plans even if this requires demolition. Lewisham has repeatedly shown it is willing to compromise, and objectors also want to make pragmatic choices to mitigate the complete mess we are living with.
However, the Archdiocese keeps claiming they are being told to demolish the school. This would only be necessary if it transpires that underneath the cladding, the build doesn’t conform with building regs, or cannot be adapted safely. Do they know something we don’t know?