In March 1913 Parliament passed the Prisoners' Temporary Discharge for Health Act. This made it legal to release prisoners because of ill health. Then when hunger-strikers had recovered their health they could be imprisoned again. The Act was a deliberate attempt to weaken the impact of the hunger strikes; the Liberal government was anxious to reduce the embarrassment caused by the treatment of suffragettes in prison. The Act was widely known as the "Cat and Mouse" Act to suggest that the government was toying with the suffragettes like a cat with a mouse.
Cick here for an account by a suffragette, Lilian Lenton, on how she avoided again and again being arrested under the Cat and Mouse Act.