The story itself isn't much but the way Beau is brought into the cast is fine. Lots of British characters and suspect British accents. There's even a My Fair Lady reference. The two cousins interact in credible ways. The backstory about Beau's banishment is quick and clear.
Nice to see a Maverick fleece one of the small-time con artists they run across regularly. Often a show ends with one of our guys having to accept a little larceny. Here Bart does Freddie very well.
A callback to a previous episode is when Bart steps onto the Cynthia B, the name of the boat that Bret, then Bart, had bought in a scam ("Cruise of the Cynthia B").
Another callback is the royal straight flush that Bart is dealt. This time in hearts; last time in spades ("The People's Friend"). Here he might have been able to play it.
Warner Bros. used the opportunity to bring in a new character very nicely. Too bad they lost James Garner.