I was recently involved in an out of school activity whereby all of the pupils in years 6 and 7 in our town (two secondary and five primary schools) were taken to a local public recreational ground where various fun activities were laid on for the afternoon. In my capacity as an LSA, I went along to support a group of 15 year 7 children, all of whom I am familiar with, alongside the class teacher. The event ended at the end of the normal school day. As the last activity came to an end, I instructed the children to make their way over to their class teacher, who was half way across the field. It was a hot day, and the lure of the residing ice cream van and burger stall was too great for many of the children, who naturally veered towards these temptations. I had an eye on them so knew their whereabouts and instructed them to meet us at the gate. Whilst having one eye on these pupils,my other eye was on the class teacher, who had reached the gates with about half of the group with her. There were also many other groups at the gate,many of whom I noticed were head counting their particular groups. As I reached the gates, the class teacher had already left the park and was half way along the path leading back to school with half of the group. My natural instinct was not to follow as the other half of the group were still in burger/Ice cream queues and I knew that I needed to make sure that these children were safe, however, I'd not been briefed on what the arrangements were for the end of the day and the dismissal of the children......so, I waited and gathered the remaining children up, explained to them that they needed to walk back to school with me and why, and escorted them back to school, whereby I dismissed them when we reached the school gates. Once back at school, I went back to the class room to retrieve my bag, and the teacher was happy as Larry sitting at her computer in the empty room! She did not enquire about the children she had not escorted back. I am only contractually bound to work to the end of the school day, which is good as I have to leave promptly to pick my own children up in time, and I was already running 15 minutes late,so I literally had to grab my things and dash out again. Having not been in the job long (only six months) I'm not clear on where responsibilities and duty of care lay. My instinct says it is with the class teacher, who, in my opinion did not ensure that the 15 children in her care were supervised adequately to the end of the activity. I know I did the right thing in ensuring the remaining children were safely delivered back to school (although not knowing for sure who she had with her I couldn't be 100% sure they were all accounted for), but as an LSA who was there to SUPPORT, I don't think it was my responsibility to do this,and in the process, exceed my work time and make myself late to pick up my own children. I was prepared to do it but am certainly not paid to! I feel that I need to speak with someone about this,to find out whether the situation was acceptable, if my actions were acceptable and for some guidance about who is responsible for what in these circumstances. However, I am wary at school about who this should be and about opening cams of worms. Sorry for the long post but any advice would be gratefully received.