What Freemasonry could he use?
The modern lodge system had already been formed under the patronage of James VI (I) and his General Warden William Schaw, before James came to England
James popularised Freemasonry in England
By the mid sixteen hundreds, speculative Freemasonry was established in England. (This can be shown by analysis of the members of the lodge at Warrington which Elias Ashmole, one of Moray’s first recruits joined in 1646.)