Last minute cancellations can be a difficult area, especially where solo bookings are cancelled because the renter has quite fairly taken the view that the weather is below his personal minima but the club on the other hand may feel it is perfectly acceptable, and then gets shirty about what is essentially a personal safety related decision. Haze on an otherwise beautiful summers day is a classic case of varying viewpoints (no pun intended). Pilots personal weather minima vary dependent on experience and natural apprehension. One mans crap weather is someone else's non event.