And why isn’t r. Mirvis releasing the name of the posek who was matir? Does he wish to remain anonymous? What does that say about the psak?
There are many capable, big poskim in England. Many. Let him ask one and publicize who it is and let that posek give a proper teshuva as poskim do. Until such time, i cannot understand why someone would accept r. Mirvis’ claims sight unseen.