Demonstrators outside the Westland Helicopters factory after a march through Hayes, Middlesex. In March 1971 the Conservative government announced a contract to sell seven Wasp helicopters to the South African Defence Force. Trade unionists at Westland’s Yeovil plant refused to work on the helicopters. Although the Wasps were supplied, opposition from British public opinion and from the Commonwealth was so strong that that no other arms deals were agreed.