In the story "Dusk," by Saki, what is meant by "requisite decency?"

The actual wording in the story is as
follows:

readability="7">

"...one could go to one's Consul and get the
requisite help from him....Unless i can find some decent
chap to swallow my story and lend me some money I seem likely to spend the
night on the
Embankment."

This little
memorized and pre-rehearsed speech is intended to suggest that the con man belongs to
the class of people who are accustomed to foreign travel and that he has been to schools
like Eton and Oxford, where the expression "decent chap" would be more likely to be
heard than elsewhere. A "decent chap" would probably be an upper-class type, one who
would do the right thing by an equally decent chap who happened to be in trouble. By
suggesting that he himself is a member of the upper class and that he is a "decent
chap," the con man strongly implies that he has plenty of money and will surely repay a
small loan. He is also challenging Gortsby to show that he too is a "decent chap." If
Gortsby is a decent chap, he may develop a friendship with the pseudo-aristocrat, who
has told him he doesn't know a soul in London and who would therefore be glad to have a
knowledgeable Londoner like Gortsby as an
acquaintance. 

When Gortsby punctures the con man's story
by pointing out that he doesn't have a cake of soap to prove his story, he is dismissing
the idea of establishing any kind of relationship with him. But then when Gortsby finds
a cake of soap near the bench, he realizes, among other things, that he has failed to
behave like a "decent chap" and rushes after the con man to make
amends.

Gortsby is not represented as a gentleman of
leisure. Saki tells us that "Money troubles did not press on him," but that hardly means
that he is rich. He works in an office and is relaxing on a park bench before going back
to his small flat. He and the young con man are probably about equal in  education and
social status, but the con man is putting on an act. Actually, the con man is putting on
two acts simultaneously. He is pretending to belong to the upper class and at the same
time pretending to believe that Gortsby is his social equal. Gortsby snaps at the bait.
He says:

"Not
at all impossible," said Gortsby judicially; "I remember doing exactly the same thing
once in a foreign capital, and on that occasion there were two of us, which made it more
remarkable...."

Gortsby has
probably only been out of England one time in his life, but he is trying to put himself
on the same plane as the other man. In Gortsby's misadventure he did not go to his
Consul but:

Luckily we remembered that the hotel was on a
sort of canal, and when we struck the canal we were able to find our way back to the
hotel."