Look at Sats and Ofsted ratings.
Go to the school around pick up time and talk to some of the parents to get a vibe about the school.
Distance, catchment, class size, whether or not it is a feeder into a secondary school.
Breakfast club or afterschool club if you need them.
Extracurriculars: Check out their enrichment club offerings. My DC's school offer a range: basketball, cricket, dodgeball, football, lacrosse, taekwondo, hockey, tennis, cheerleading, theatre, science club, coding, knitting, arts & crafts, and Spanish. Lunchtime clubs include choir and chess. During school hours they also offer musical instrument lessons: piano, flute, guitar, violin etc.. as well as forest school.