Sheffield Council advertise for Reading and Talking Volunteers to visit Primary and Secondary schools. This would provide me with experience in a school but at the same time something I can work around having two children/studying. The role requires between 1/2 to 1 hour each week for between 6 to 10 weeks.
It is also one of the ways recommend by the Get Into Teaching Website to help gain classroom experience:
“To improve your chances of gaining school experience, you could also offer to volunteer at a school. Volunteering in general is a great opportunity to gain experience of working with children. You could also volunteer to work in a youth club or as a Scout or Guide leader – particularly during summer when schools are closed.
Many volunteering opportunities, such as after-school clubs, sports coaching or youth schemes, take place during evenings or at weekends, so you can fit volunteering around your existing commitments.”
UPDATE: I attend a training session on the 26/02/2018 and have contacted the school about arranging a suitable time to start my volunteering.