Professional as in career, as in my case, when I first joined the B.D.S. they had a category of professional member, criteria you had be in full time employed as a stalker, don't know why but they dropped it some years ago, I have my
membership card from 1987 it states professional member, think this is when it stopped, when I started working as a stalker almost all stalking available was through estates and accompanied, very few individuals were able to get stalking leases
Now all lot more people have their own stalking areas and a lot of them will take out some clients to help offset their costs
or what ever , and some taking on leases as a business, so I don't think the division between Professional and recreational is as clear cut as it once was.