Orla,
the original idea behind the Discover Primary Science (now known as Curious Minds) was to promote hands on activities in the classroom for the new (at the time) Science Curriculum. The activities very much make a point of using every day materials that can easily be sourced. The awards of excellence were introduced to let schools get recognition for what they are already doing, but for schools that have received the awards multiple times, the latest Platinum tier really challenges schools to a greater STEM awareness across their communities.
As their website states:
The Platinum Award is a significant step up in terms of effort from a Gold Award. Entrants must choose an outcome at the beginning of the year, achieve that outcome and then demonstrate its impact.
Annual applications for the Platinum Award will be capped at 30 schools. Sign up early to avoid disappointment.