There aren't many schools with their own particle accelerators so this set of resources will provide you with plenty of alternatives inlcuding hands on demonstrations and activities. The challenge here is to delve into content that goes beyond GCSE and into A level and beyond without overwhelming the students and perhaps youself.
If you want to get up to (and over) speed on particle physics more generally then there are many books and videos around. A Very Short Introduction to Particle Physics by Frank Close is a good primer but perhaps the best beginners guide that isn't too long and daunting is from Nari Mistry at Cornell University. It's only 20 pages and available free HERE
Whilst this list provides a source of information and ideas for experimental work, it is important to note that recommendations can date very quickly. Do NOT follow suggestions which conflict with current advice from CLEAPSS, SSERC or recent safety guides. eLibrary users are responsible for ensuring that any activity, including practical work, which they carry out is consistent with current regulations related to Health and Safety and that they carry an appropriate risk assessment. Further information is provided in our Health and Safety guidance