Orders: Void... Mitres: Valid
Former Anglican BishopsTo reiterate: this is envisioned in the case of a (married) former Anglican bishop who hasn't been appointed ordinary in his respective jurisdiction and is, in Catholic terms, a simple priest.
§3. A [married] former Anglican Bishop [ordained a Catholic priest -- not a bishop] who belongs to the Ordinariate may be invited to participate in the meetings of the Bishops’ Conference of the respective territory, with the equivalent status of a retired bishop.
§4. A former Anglican Bishop who belongs to the Ordinariate and who has not been ordained as a bishop in the Catholic Church, may request permission from the Holy See to use the insignia of the episcopal office. [emphasis added]
Long story short: B16 wants Anglican bishops -- high-hats, wives and all.