I believe this year's SWEFTA Rules say that the competition will start at 09:00 and not before.
Zeroing can be done before, but at about 08:30 ish, the prizes will be given out from the previous shoot, followed by a short briefing and then a shotgun type start for 09:00.
Any late competitors can feed on during the day, but giving priority to those already on the course.
I think that's all correct Si.
AA Field Target Team 2007~2011
East Devon FTC - SWEFTA Club Champions 2006/2007/2008/2009/2010 & 2013/2014/2015