Immediate First Aid reduces the severity of a burn injury and improves outcome.
A sensible, evidence based, approach to First Aid is outlined in the British Burn Association First Aid Clinical Practical Guide providing guidance on the management of thermal, chemical and electrical burns and burns caused by tar and bitumen as well as cold burns (frostbite).
Visit the British Burn Association's website for further guidance on pre-hospital care.
Other pre-hospital guidelines you may find of help:
SWUK Guideline on Wound Management
SWUK Guideline_Initial Assessment and Management Burn Injury v1a (Oct 2018)
SWUK Guideline on Smoke Inhalation & Airway Management
BBA Initial Management of Ocular Burns
NICE Burns and Scalds Summary