Unlike in school nursery/private day nurseries there is a requirement to attend, and this is monitored! Non-attendance CAN result in investigation by the council's school attendance team and ultimately in sanctions for parents!
ALL infant children receive a free school meal through the government universal free school meals scheme, there is no need to apply for this, you are just not charged should your child need/want a school dinner. Despite this, it is still worth completing a FSM application as any eligibility lasts 6 years (potentially whole of primary school).
An example school menu is included below (this could easily change - I will update it when I know for certain)