PORRIDGE ISLAND. A paved alley or footway, near the church of St. Martin's-in-the-Fields, destroyed in 1829, when the great rookery (of which Bedfordbury is still a sample) was removed from about the Strand and St. Martin's-lane. [See Bermudas]. It was filled with cooks' shops, and was cant name. The real name is, I believe, unknown.
Peter Cunningham, Hand-Book of London, 1850