I would want a fair society without a huge gap between the top and bottom, I’d do this by raising minimum wage and ensuring the top levels of a company could only pay a certain multiple of the bottom wage.
I’d make a universal basic income so that no one went without.
I’d make state education better, with decent spending on schools teachers and facilities. Private schools would have to take a %age of non fee paying local children.
I would reform the nhs to make patient care front and centre of all decisions- rather than budget. I would trust the doctors and nurses to say what resources were needed and reduce some of the managers (I’m well aware that a hospital can’t run itself)
I would reform the criminal justice system to reflect that fat that a lot of crime is bourn out of poverty and lack of life chances / choices. Drug crime would be dealt with by rehab and employment, rather than punishment. The focus of the justice system would largely be on prevention of reoffending rather than on punishment.
To pay for this all, taxes would be higher than in the U.K. but the citizens would view this as part of thier civic duty and not try to dodge paying tax.
Human rights would be enshrined and the society would run on the basis that all humans are alike in dignity, discrimination of any sort is banned. Every member of society has equal value regardless of thier age / sex / race / sexuality / gender / trans etc. Hate speech would be unheard of.
Refugees would be welcomed and integrated into society. We would maintain ties with Europe.
That’s about it I think!!