[Savage GT]

So the OP says he and his group do the "right thing" when riding and complains about cyclists who do not. Do you also get on motorist forums and complain about motorists who do not do the right thing, but idolise yourself because you do the "right thing" in your car?

TBH no, I only frequent car forums relative to the vehicle I own and only then for the purpose of keeping updated on the vehicle and its systems.
I would never idolise myself, I have my faults and I know what they are, but I do give other road users of all vehicle types consideration whatever vehicle I am in/on, and yes, as I already said there are bad apples in all camps.

Lets keep it calm and productive, it was not my intention to start a this vs that argument.
What I did hope to discover is was there a reason for the non single file behaviour when roads or traffic would, (in my mind logically), indicate otherwise.

What doesn't help is the UK highway code is fairly open to interpretation the actual wording is: 

Never ride more than two abreast, and ride in single file on narrow or busy roads and when riding round bends

Parents with kids, I can understand. Larger groups I can see the logic in making a shorter "train" to get past, but 4 or less would be better dropping into single file IMO.