The latest version of the Constitution (amended in Feb 2020) is at the link below:
Diocese in Europe Constitution - Feb 2020
Archbishop's Instruments:
The following documents are also available at the links below:
The Archbishop's Instrument of 31 January 2011 (dealing with a wide range of legislation);
The Archbishop's Instrument of 21 October 2013 (dealing with the Clergy Discipline Measure); and
The Archbishop's Instrument of 12 February 2020 (dealing with Canon C12 and the licensing of clergy).