"In the above paragraph the highway code quite clearly states that the other rules, i.e. those containing 'should/should not' are advisory. As such they do not reference the law because they are NOT legal requirements"
IMO you are downplaying it for your own ends, as "that paragraph" says:
Although failure to comply with the other rules of The Highway Code will not, in itself, cause a person to be prosecuted, The Highway Code may be used in evidence in any court proceedings under the Traffic Acts (see The road user and the law) to establish liability. This includes rules which use advisory wording such as ?should/should not? or ?do/do not?
That does not mean these rules are for ignoring if you find them inconvenient, or if you feel they dont apply to you, as many cyclists have believed on this thread.
"yes, if there was somewhere safe for them to pull over, then they should have pulled over to let traffic pass, but as far as I can see, the OP hasn't said that there was somewhere safe"
You may note, by the difficult feat of reading thecA's post, that the OP thought of turning off a few times so she was no longer 1st in the line of traffic behind them, hence there were clearly opportunities to pull over. And I reckon the number of 10 minute stretches of country road with no ability to pull over could be counted on one hand.
"I'm happy to accept that the cyclists were acting unreasonably if it is clear they were purposely blocking up the road"
Good Lord - cyclista finally admits OP's cyclists may have been "unreasonable" shock!
Yet the poor frustrated motorists caught behind are called twats, twunts, cunts etc for having the presumption to not be happy.
There were only 2 twats/twunts/cunts in this story, and they were on bicycles.
And IMO the motorists were well within their rights to alert the cyclists to their presence with their hooters, repeatedly if needs be. Think of it as a public duty in helping those cyclists on their journey towards better understanding the highway code and being more considerate road users 