We are all semi programed to help people. Some of us are more inclined than others and as a result they may have offered to be the First Aider in work or have taken additional training in resuscitation and care. Whilst in many countries, such as the USA and France, there are built in laws protecting any one administering first aid and resuscitation if they are qualified or if they are not. In the UK we do not have such laws and whilst it may seem counterintuitive to not help someone if you have medical indemnity you are covered.
This is where https://www.mprs-uk.com/products/general-practice/medical-indemnity-insurance/ can help. If you are one of the many people in this country that has given up their time to learn first aid and resuscitation techniques you need this extra cover. Should something go wrong during the procedure there is still a chance that the person who is receiving the care can sue you for negligence even if you have saved them.
It is unfortunate that we must consider this in our society but as we become more litigious we need to be protected as much as possible. This is not just the domain of the medical professionals.