I think its about £100 a year Tosh, give or take a few quid to join up. Then if they get asked to quote for work as I understand they send in upto 3 guys registered with them, put in the highest price to whoever they are quoting and if they get the work they give it to the guy who quoted the least, the money they get is your joining fee plus whatever the difference between the highest and lowest quotes. I have no idea really if this is how they really work but I remember it being asked on here before and thats pretty much how most people said they operate.