Reply To: A Chief Rabbi Attends the Coronation in a Church?

R. Mirvis clearly said that he received a psak from the London Bais Din. The dayanim on the bais din are well known and they are lead by Harav Gelley. Furthermore, Rabbi Brodie Z”L attended the coronation of Queen Elizabeth and at that time Harav Hagaon R. Yechezkiel Abramsky ztz”l (mechaber of the Chazon Yechezkiel on the Tosefta) was the Rosh Bais Din.
The reason a Teshuva is not written or publicized should be obvious.