Leave it to EF to get in a debate over some poor soul's thesis. People, do not try to claim the Queen's English if you are from the Americas. Likewise, people from the former British protectorates, do not try to rap.
Do you call the bathroom the loo? You speak British English. Do you call it the john when you are at home with your feet up? You speak American English. Likewise with the boot/trunk. Ditto if you order a pint or a draft. Ditto if you think innit is a word versus ain't. How many times are we going to "round" or "around" this block?
Anyway, I completed your survey and I understood every question.