Seating at English Wedding Receptions - Bernard and Lydia
Just watching this now (for the millionth time!), and have noticed something about English wedding receptions. At Bernard and Lydia's wedding, the seating chart seems to be random. For example, Charles ends up at a table with all his former girlfriends, and Fiona ends up seated next to an older woman she doesn't know (the Lesbian conversation). Meanwhile, Matthew and Gareth seem to be seated at/near Carrie's table.
At American receptions, people are seated near/with people they know... friends, relatives, co-workers, etc. Is the seemingly random seating chart at Bernie/Lyds reception normal?