Consol: Total electrics failure while above cloud over a lumpy part of the country in a Prentice, with a trainee signaller in the back.
I received a poke in the ribs and he passed a note to me, it said "we have had an electrics failure". He was clearly one of our brighter students.
After a short while he managed to get the intercom and some of his gear working and volunteered to get me a bearing.
I sat there with my half mil. topo of central England open on my lap ready to get some idea of my position, and he came up with a Consol bearing from Stavanger !