British Polite-isms

Us British are just too damn polite sometimes and Trinity College London have released new research exploring the role of polite-isms, or indirect expressions used to soften requests in British English.
They found that the average Brit used 14 of these polite-isms a day to avoid confrontation and to be nice and avoid any unnecessary tension although non-English speakers find our strange way of saying something while not actually saying it confusing, overly complicated and don't recognise when to use a polite-ism.
The top five polite-isms used are 'Could I just squeeze past you' rather than 'Could you please move out of my way', 'I’ll let you know' rather than 'No', 'I beg your pardon?' instead of 'I’m fuming', 'I’m a bit busy at the moment'  rather than 'Leave me alone” and 'No rush' when we actually mean 'Hurry Up'.   
Other favourite's are 'No Worry' (I am but will pretend i'm not) , 'With all due respect' (Your wrong) and 'As per my previous email/letter  (As i have already told you) and 'I’ll keep that in mind' (I will forget it 10 seconds after you have gone) and 'A gentle reminder' (You STILL haven't done this??)
It does seem to be a very British trait and I use the 'Gentle Reminder' and No Rush all the time although my version of that is 'When You Get a Minute could you...' which is a lot less confrontational but seems to get across the message that the minute you should get is NOW.
I can see how it would be confusing for non-English speakers but also it shows how us Brits can take them to be rude sometimes, nobody likes a direct No when you ask for a favour or if they would like to do something together, much more polite to at least pretend you would consider it.    
So with all due respect to non English speakers, I hear what you're saying about this being overly complicated and will bear your interesting idea of not using them in mind but if you find this confusing, wait until you hear about Rhyming Slang, that will blow your mind me old China.