I didn't think clubs were allowed to introduce extra equipment requirements to CTT accredited time trials. Or are these unofficial ones run under some more clueless insurance?
If it's anything like TTs around here, most are held on some of the dodgiest roads around where you're unlikely to see another cyclist, but many of the cyclists will be moving fairly fast and I suspect most of the reason for the fairly low injury rate is the eye-catching temporary "cycle event" warning signs posted at entrances to the TT route!