This was a consumer kit aimed at schools. Looks like there were many different types as obitoo has another that I have never seen.<p><a href="http:&#x2F;&#x2F;gallery.nen.gov.uk&#x2F;asset78077_1582-.html" rel="nofollow">http:&#x2F;&#x2F;gallery.nen.gov.uk&#x2F;asset78077_1582-.html</a>