my social production

This is the rule:

Motorists, including motorcyclists, MUST stop at the first white line reached if the lights are amber or red and should avoid blocking the way or encroaching on the marked area at other times, e.g. if the junction ahead is blocked.

[Laws RTA 1988 sect 36 & TSRGD regs 10, 36(1) & 43(2)]

Source: The Highway Code, Road junctions (170-183)

Is this rule followed? Not at all. Here are some examples from my ride today:

Is this rule punishable? Yes, in theory. Are people actually punished for such violations? Not that I know of.