In 1953 and 1954 Beamish fought hard and negotiated extensively to secure passage of what was (at that time) the longest private member's bill to go before the House of Commons. This bill would become the Protection of Birds Act (1954). The Act aimed to to protect birds, their nests and their eggs all the year round, with exceptions made for game and food birds. During the second reading of the Bill (4th December 1953), Beamish said that

"The need for new legislation is very real indeed and we can all agree with my hon. Friend that many of our neighbouring countries of Europe and other parts of the world have much more advanced legislation on this subject than we have."

The Bill  received Royal Assent on the 4th June 1954.