 To escape the restrictions, non-patent theatres along the Strand, like the Sans Pareil, interspersed dramatic scenes with musical interludes and comic skits after the Lord Chamberlain's Office allowed them to stage burlettas—leading to the formation of the modern West End.Outside of the metropolitan area of London, theatres like Astley's Amphitheatre and the Coburg were also able to operate outside of the rules.The exploding popularity of these forms began to make the patent system unworkable and the boundaries between the two began to blur through the 1830s until finally the Licensing Act was dropped in 1843 with the Theatres Act.