From https://www.preciousseed.org/history.cfm
It is hard to believe that the work of Precious Seed Committee has been going for sixty years. In 1945 several meetings were held in Taunton, Devon, for prayerful consideration of the situation which then existed. For some time brethren had been concerned about the lack of teaching with regard to New Testament church principles. Out of this desire came the magazine Precious Seed which would seek to be ‘a magazine to encourage the study of the Scriptures, the practice of New Testament Church principles and to stimulate interest in Gospel work’. Those early brethren have now all been called home but the pattern has been followed by their successors.
The prepositions from the Greek have given rise to endless queries and answers, and also translations—eg: “and we shall reign on (epi) the earth” (KJV); “and they shall reign over the earth” (Darby). Who are the “we” or the “they”?
Some say when it comes to reigning, there is a difference between the locality where the king lives and the sphere over which he reigns. So from the prayer, “Thy will be done in (epi) earth, as it is in (en) heaven.” (Matt 6:10)—The Lord needn’t be on the earth to have His will done.
If Christians are meant in Rev 5:10, where is their dwelling; earthly or heavenly and what is the sphere of their reign?