Whoops ive wet my pants, patch!!  There is no such thing, if you provide professional friendly an reliable service you should have a problem,  but ringing him up going blah blah,  your having a laugh, your lucky if some fudgepacket rang me giong blah blah,  I would turn your phon into a suppository and smile while posting video of it on u tube,  all jusst for the cheak of it,  
every april they come out of the woodwork with flyers call calling, but I know if im doing my job right and providing correct service,  ive got nothing to worry about, its that simple, I dont need agreements with any local shinners, I just get on with my jobs,