sentences:  As a result, the UK wanted to demonstrate its ability to manufacture megaton class weapons by proof-testing them before any legal prohibitions were in place.According to an article in "New Scientist", Prime Minister Harold Macmillan was also hoping to convince the US to change the McMahon Act, which prohibited sharing information even with the British, by demonstrating that the UK had the technology to make a thermonuclear weapon (an H-bomb), and he put William Penney, a British professor who had worked in the Manhattan Project, in charge of developing this bomb.In this the test of the Orange Herald was successful.