In this document, readers will find a summary of various national guidelines or guidance, and CLEAPSS' advice.

We have extensively reviewed all relevant Regulations and accompanying advice on the teaching of Design and Technology. Scotland, and Northern Ireland do have regulations restricting class sizes for practical subjects to a maximum of 20, but this does not have any bearing on England and Wales.

Schools are increasingly promoting an inclusive agenda. As a result, science and D&T departments may find students who use medical oxygen are following a normal school curriculum and are in their classes.

The use of compressed air to drive portable power tools.The use of compressed air and related equipment to teach the use of pneumatics.

Developing colour or black and white films or prints. Fixing colour or black and white films or prints. Stop baths used between developing and fixing. Chemicals used for specialist treatments.