There is pretty good guidance on http://www.hse.gov.uk/fi...qs.htm#appointed-persons But if it helps - we insist that at any place where our organisation has a H&S responsibilty there is a recognised person with sufficient training and common sense to deal with most issues. As it's hard to determine peoples competency we insist that the minimum training is EFAW for us to meet this need. Your issues are around Saturday working, you might need to risk assess the Saturday working in order to determine what level of first aid you need you may also have issues around lone working that were not there during the week. But if the work is low-risk (i.e not at height) and you are quite near help (eg. around the corner from an ambulance station) then have a person with EFAW for short periods should be OK, all down to assessment and doing what is best, we had a debate on Lone Working and first aid recently and there were quite a lot of people who felt there should just be some form of blanket first aid training for everyone.

Thanks for your comments on this. To be honest, I agree, but just wanted additional support / clarification on this. There is no lone working on the site, but there is always work at height. Thanks again.