oooookkkkkaaayyyy..................
<<1. he has obtained address info about me through illegal use of the Police National Computer via a Mason colleague/police officer.>>
Contact your nearest Police Station as soon as possible; as you've stated, this is illegal and the 'claimant' and his informer will get into serious trouble for this.
<<2. Threatened to kill me.>>
Make a statement to the Police about this matter.
<<3. Contacted the Headmaster of my childs school, also a Mason, for info as to my whereabouts.>>
If there has been a breach of the Data Protection Act, instruct a Solicitor to start proceedings against the school.
<<4 Has a proper criminal record, undisclosed to the MAsons. >>
And you know this................how ??
Or it could be that as the Defendant you DO actually have a case to answer and all of the above is nonsense ?