Hmmm, that never occured to me! This is an interesting note. But I
really see no logic behind it - how my desire to pay at the first
opportunity leads him to believe I would only pay if challenged? It is
at least as likely as me being simply inexperienced in such situations,
and just doing what I thought I had to do. Oh, and please, don't
remind me about the stupid corner shop where it all started.

I am gutted...

R