A and C
I have seen and have heard and even cringed about some of the actions taken of which you speak and have heard we are seen as one of the worst security towards crew in the UK by talking to crews and reading from websites such as this one.
Also I've seen the many different interpretations of the DFT rules too and agree that there isn't enough uniformity regarding the rules.
Its good that you also treat people how you expect to be treated as I've said I've seen many others who don't have this simple common courtesy, but I can't speak about the actions of others (let alone apologise as it would be a hollow one) and am always mindful of the need to do the job correctly.
Apart from that I wish you safe and happy flying (and transit through MAN)