What do I need to drive a left hand drive car in the UK?

I have to drive to the UK in my left hand drive 2021 Honda Jazz. Do I have to: 1) adjust the headlamps 2) have a FR sticker 3) adjust the car to count in miles not km 4) anything else I haven't thought...

I am a UK resident but have a home in Spain - can I bring my Spanish registered car back to the UK for short periods?

I am a UK resident but have a home in Spain. Can I bring my Spanish registered car back to the UK for short periods?