Agriculture (Silo Subsidies) Act 1956
“ A scheme may make provision— (a) for defining or limiting the works in respect of which payments may be made under the scheme; (b) for different rates of subsidy, or different methods of calculating rates of subsidy, according to the nature of the works; (c) for prohibiting or restricting the making of payments under the scheme in cases in which payments out of moneys provided by Parliament under any other Act, or out of moneys provided by the Parliament of Northern Ireland under any Act of that Parliament, are available in respect of the same works ”
