2For the proviso to section 4 of the [1934 c. 36.] Petroleum (Production) Act 1934, there shall be substituted the following proviso—
“Provided that the Secretary of State shall not give an authorisation under this section in respect of any premises unless he is satisfied—
(a)that the British Gas Corporation have been given an opportunity of purchasing the gas at a reasonable price, and
(b)that the gas is to be supplied to those premises for industrial purposes only”.