hi! Other input is welcome, but just fyi, there have been a couple of earlier posts on British culture that can get you started
I have heard it suggested that in the C18th and earlier, the English were seen as an emotional, demonstrative race by other Europeans. This is at odds to the more modern perception of repression & stiff-upper-lip etc. Is there any truth to this change in character? If so, what caused it? - featuring /u/skedaddle
How and when did the British get there stereotype of being gentleman and all that - featuring /u/banal_penetration