Guys, I'm afraid helmets etc. are, as I understand it, from now on mandatory for all events with public access and the organisers have at the moment no alternative but to respect the law of the land (via their insurers of course).
If anyone is interested go online to
http://iopd.org.uk , an organisation who have jumped onto a very clumsy bit of parliamentary legislation designed to curtail public nuisance caused by amateur offroading which now makes anyone involved in or organising a motoring event which does not have the IOPD registration for exclusion under Article 1371 of the Road Traffic Act liable to prosecution!