I think it is quite simple really, you sign something to say that you understand the rules when you buy the ticket, the rules are clearly printed on the ticket. If buying a ticket over the net you tick a box to say you understand the rules. Permit outlets should ask the angler if they are able to read and understand the rule, if the angler has reading difficulties then the permit outlet should read the rules to the angler before the angler signs to understand them, I doubt those with reading difficulties would be able to get to the point of being able to purchase over the net. Rules are rules, break them and loose the right to fish on that water permenantly, if you do not like the rules of a particular beat then go fish somewhere else.
Iain,
The treble thing has bugged me for a while. I only fish with doubles as many places now insist on them and as I fish a few different rivers it makes sense to me only to tie on duble hooks. When fishing tubes I use Salar doubles, these are as heavy as most trebles commonly used for tubes so do not make the fly swim much differently. I will debarb most of my hooks when fishing in the spring. Kelts have to go back legally and all springers on the Don should be returned as requested by the DDSFB conservation code however, the jury is till out for me whether a micro barbed double may cause less damage to fish than a than a debarbed hook which will move about more whilst playing a fish. I don't think I loose any more fish when fishing barbless hooks.
Cheers
Ben