I want to use a road as part of a community treasure hunt type thing I'm organising - so potentially 150+ people might be walking up it. It's clearly marked on Google Maps (although not streetview) - no sign to actually say it's private although I'm assuming it is given that it's a tiny tarmacked track (wide enough for a car, and there are several houses on it) off quite a busy road. The entrance to it seems to have no road sign at all, if that's significant.
Is there a way (short of paying money) to find out a) if it's private and b) if so, do the general public have right of way?
Thanks.