I think there is agreement which indicates that there was no formal countrywide organisation which controlled the training and conditions of stone masons. There is however, definite evidence of orgainisations of masons in larger cities.We have the Regius MS dated about 1390 which alludes to masons.
The Cooke MS dated about 1450 which does the same and is said to allude in places to Ranulf Higdons Polycronicon written 100 years before.
Neither of these MS would have been written for any other reason than for a masons group.
Edward IV, 1461-1483, granted the Society of Masons, a Coat of Arms, indicating there must have been some organisation.
I however, have always suspected the theory that masons signs were used originally to identify the level of competence of the prospective employee applying for a job in an unknown area purely on the grounds of a lack of a country wide organisation.
However, the principles of both the Norman and Gothic cathedrals were not invented by itinerant stone mason that happened upon them by chance.
There must be little doubt that medieval architects would have been educated at a great seat of learning, where the applied principles of their trade would have been taught.
News also would have been spread by travelers that these massive religious structures that were greater that anything seen before were being erected in cities and educated architects would have visited these cities to learn and no doubt would have communed with the architects and masters to exchange information.
So yes, I would agree that they my not have been country wide affiliated guilds communicating their science on a daily basis.
But in each major city all trades were regulated, masons were no exception to that and that was the start of the great british tradesman who jealously guarded his trade secrets, right down to our life times when we have seen the apprentiships and trades diminish so that a Glazier will be a Carpenter will be a Builder will be a Gardener etc. Many trades are no longer defined.
If you bring in the scottish question, now thats another totally different ball game.