Hello Machew and welcome.

The First Aid at WORK Regs (my capitals) put a duty on employers to make provisions for first aid for employees - in a low risk environment like a church with few (if any) employees then you may only need an Appointed Person, who can take charge in an emergency and call 999. Only if you are carrying out riskier activities, or if the location means help may take some time to arrive then you may want to think about training someone. There are 2 levels of training: 1-day Emergency First Aid at Work; and the 3-day First Aid at Work course.

The law does not require first aid for the public, but many organisations have a policy to include the public in their provision.

The HSE provides useful guidance on assessing your first aid needs, have a look and I think it will enable to to make a decision of what you need in your circumstances. http://www.hse.gov.uk/fi...aid/needs-assessment.htm