In response to the 'nothing ever happens' angle and the 'this is a rebellion??' angle:
The British govt hates its own people to a cartoonish degree and any kind of slight towards it is met with seething rage every time. This is a non violent rejection of their rule that every average person can partake in, its stage 1 civil disobedience and the govt is losing their fucking minds over it. The councils are taking them down as quick as they can and labelling the raising of them as a hate crime in some instances but theyre being raised faster than they can take them down. Its an escalation game that only goes to expose how anti British they actually are. This also comes off of the heels of increasingly louder and more violent rejections of the criminally imported migrants, some of these protests happening outside the hotels the government is putting them up in.
Its not nothing, but where it will lead we've yet to see. British maidan maybe. Keep in mind the govt there is also pushing hard for a return to conscription + they recently locked the internet behind ID checks. The escalation is real.