It's not law, but a set of advice partly based on legislation. The things in it that are glossed 'You MUST' or 'You MUST NOT' are mandatory, while 'You SHOULD' indicates advice. Bear in mind that many UK cycle campaigners disagree strongly with some advice.
Obviously, there are plenty of small specific differences in how traffic regulation works here, but you'll get used to those easily enough.
Why recommended? starts helmet debate :)
Martin, the UK Highway Code is here:
https://www.gov.uk/browse/driving/highway-code
It's not law, but a set of advice partly based on legislation. The things in it that are glossed 'You MUST' or 'You MUST NOT' are mandatory, while 'You SHOULD' indicates advice. Bear in mind that many UK cycle campaigners disagree strongly with some advice.
Obviously, there are plenty of small specific differences in how traffic regulation works here, but you'll get used to those easily enough.