Take time each week to think about the activities that are taking place and to what extent they put children and young people at risk. It is a good idea for at least one of your workers to attend a basic first aid course and to take responsibility for ensuring that the first aid kit is well stocked. Make sure everyone knows where the first aid kit is kept and take a travel version with you on trips.
First Aid training is available through:
The British Red Cross http://www.redcross.org.uk/en/What-we-do/First-aid/First-aid-training
St Johns Ambulance http://www.sja.org.uk/sja/training-courses.aspx
Or google "First Aid Training Providers" to see if there are any other accredited providers in your area.