Are you involved in cycling or cycle training in your school? Need to source low cost cycle helmets or high visibility items? This could be the site that you are looking for:
The Bicycle Helmet Initiative Trust is committed to saving young people’s lives by promoting safe cycling and, in particular, the use of cycle helmets. They can provide cycle helmets in a range of sizes and colors for just £7.50 each, and also have a range of low cost high visibility items too.
Link to the Helmet scheme pages