I doubt if anyone will ever get back before the first field recording in 1952.   It was performed live at a Folk festival in the Albert Hall, London January 1953. For some reason the Wiki for the song has never been altered, and has an erroneous date given of 1957 for the first recording of the McPeake's re-structured and modern rendering of 'Go Lassie Go/Wild Mountain Thyme'. The date of 1957 is wrong - as there is the 1952 recording and here..

"Frank and Francis also sang the lovely song. “ Will you go lassie, Monday 12 January 1953, Northern Whig - Antrim, Northern Ireland Page: 2