The official Tattoo and Body Piercing Guidance. The tool kit lists the requirements for operating a studio safely and correctly. This is the same criteria Environmental Health officers will be looking for to issue you with a Body Piercing License.
Follow the link below.
https://www.cieh.org/media/2004/tattooing-and-body-piercing-guidance-toolkit-july-2013.pdf
Follow the link below.
https://www.cieh.org/media/2004/tattooing-and-body-piercing-guidance-toolkit-july-2013.pdf