It has for some time been the practice of the Holy See to confer the title ‘Monsignor’ on Anglican bishops who have joined the Catholic Church. It is a gracious gesture, especially since no equivalent title has previously existed among Anglicans. But changes are afoot.
So numerous are the clerical husbands of female bishops that it has been decided that a special title be created for them. The Queen has therefore agreed that they should henceforward be known collectively as ‘Monsignori’.
Crockford’s Clerical Directory usefully explains that a Christmas card, for example, intended for the Bishop of Gloucester and her husband should be addressed:
The Rt Revd Rachel and Monsignor Guy Treweek.