If you’re scratching your head for resources, try these:
https://ctbi.org.uk/remembrance-sunday (Churches Together in Britain and Ireland)
https://www.messychurch.org.uk/resource/messy-remembrance (Messy Church)
C of E: includes ideas for non-biblical readings and the Coventry Cross of Nails confession: https://www.churchofengland.org/prayer-and-worship/worship-texts-and-resources/church-england-world-war-one/general-guide-resources-commemorating-world-war-i
These Bible Society resources offer a church pack which includes a service plan and a short sermon, suggested hymns and readings and ways to visually represent the scale of loss: https://www.biblesociety.org.uk/what-we-do/england-and-wales/world-war-1/ww1-church-resources/
The diocese of Oxford has a range of resources for children’s leaders and teachers: https://www.oxford.anglican.org/mission-ministry/youthandchildren/children/armistice_and_remembrance_resources_for_children/
All-Age Worship resources offer a full template with lots of options: http://www.allageworshipresources.org/wp-content/uploads/2016/10/SAAW015-Remembrance-Sunday.pdf
There is a shedload of other stuff on the web, including resources from the Baptist Peace Fellowship, the Methodist Church, the Church of Scotland and others.