It's worth reading the whole Highway Code (the rules of the road for the UK), including the bits that only apply to those you'll be sharing the road with. That's not to say people follow it, of course.
I've done the opposite, and switching from riding in the UK to France or Spain wasn't too hard. As a general rule signalling your intentions early and moving into the centre of the lane buys you time. Note that in the UK there is no rule saying bikes have to stay close to the kerb; taking the lane is officially advised in many circumstances though drivers aren't always aware.
One thing to watch out for is local variations in driving/riding culture within the UK. The rules don't change, but the behaviour does.
As an extreme example: in central Cardiff it's very dangerous to stop on an amber light, and often safer to go through a light that's just turned red than to stop sharply - because the bus behind probably isn't stopping. This is illegal, but stopping at lights without a shoulder check is suicidal. In most other UK cities I ride in, it's safe to actually follow the rules.
Even more locally: In a small area in Bristol that I ride daily, drivers seem particularly bad for not indicating their turns on roundabouts, or when turning left crossing a bike lane - meaning if you want to use the bike lane as designed, you have to be very careful that you can get to a safe spot when the lights change (generally a good idea).