Do you know William? - Give my regards to broad street

[NAYDON]

This is a fragment of the movie "Give my regards to broad street"
When Paul arrives on the radio to do the interview.
Why does he present him as William?

[B]

"Broad Street"- interesting death clues?
invanddis.proboards.com/thread/3083/broad-street-interesting-death-clues

William
<--- not William