It's also why the practice diversion is included in the PPL Skill Test.....
I say to my lucky victims "Uh-oh - the Met Office lied to us. There's a sheet of fog covering everwhere beyond that town ahead. So, when you are ready to, please take me here" 'Here' being the diversion aerodrome whose information I then give him from Pooleys.
It's been freezing cold and foggy ALL DAY here in British West Oxfordshire - even the birds have been walking.