I was in the shower and thinking... Dangerous...
There had to be some kind of Lost Procedure that he should have begun to follow sometime after realizing he was lost and a good time before he ran out of fuel.
I thought about IMC... There had to be a procedure for inadvertent entry into cloud too.
Radio calls. Couldn't we DF radio calls back then?
If he was VMC I'd suggest that London and the river Thames would be a pretty good "overshot boundary".
There's a lot of things that don't make any sense...