How did the Trade Unions of Britain lose Influence during and after Thatcher?

-In 1979, when Thatcher came to Britain, Trade Unions had 13 Million Members. Thatcher tried to Reduce the Power of Trade Unions and argued it was a Supply Side Policy to make British Industry more Flexible and Competitive -The Decline of the Large Manufacturing Industries (Shipbuilding, Mining) also contributed to the fall in Membership. The Service Sector had been Growing Rapidly, which hardly had any Service Attention -Workers who are on Flexible and Part-Time Contracts will also be less Likely to Join a Union. -Today, the number of Union Members remains at 6.4 Million People (23%)