Driving laws toughened up, especially longer sentences for causing death/injury by careless/dangerous driving. I'd also raise the driving age to 21!
Tougher sentences for animal cruelty and more monitoring of people banned from keeping animals for longer periods/life.
Much higher standards for animal welfare.
Stricter regulations properly enforced for child maintenance. No more NRPs getting away with paying little or no child support. 
Abolish UC and replace with a citizens' wage.
I'm not sure how to implement this, but scrap zero hours contracts for most workers,and only offer them to the few people who want to work in this way and fully understand the implications; e.g. students; semi-retired people etc.
Legalise drugs.
Legalise euthanasia in certain circumstances and with very strict criteria.
More regulations and laws that are kinder to the environment.
Raise the age of consent to 18 for everyone and make it illegal for anyone over 25 to have intimate relationships with any 18 and 19 year olds.