In this situation, the term ‘responsible adult’ refers to a person that assumes complete control and responsibility, whether parental or assumed responsibility, for the safety, welfare and behaviour of the child in question.
In this situation it can be deemed that ‘responsible adult’ is the same as ‘appropriate adult’ in the text below in bold italics; taken from Wikipedia in 2017.
No official of Potteries Active Kids, or volunteer at Potteries Active Kids, will be deemed to be a ‘responsible adult’ over any child other than their own child, or a child for which responsibility has been granted to that official or volunteer, by a previous and up until that point, current ‘responsible adult’ away from Potteries Active Kids and before an event has begun.
Whilst volunteers and officials may assume a role of responsibility, and endeavour to do their best for the welfare of all of the children in attendance at Potteries Active Kids events, legal, moral and social responsibility lies with the ‘responsible adult’ and not with any official or volunteer at Potteries Active Kids.
Taken from Wikipedia (2017);
“In English law, an appropriate adult is a parent, guardian or social worker; or if no person matching this is available, any responsible person over 18. The term was introduced as part of the policing reforms in the Police and Criminal Evidence Act 1984 and applies in England and Wales.”