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Application of section 50B of Act of 2000 to decisions under Principal Act | 
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18. Section 303 of the Principal Act is amended by— | 
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(a) the substitution of the following subsection for subsection (3): | 
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“(3) (a) Section 50B of the Act of 2000 shall apply and have effect in relation to a decision or an act of a local authority (including in its capacity as a planning authority) or the Commission under this Act as it applies and has effect in relation to a decision or an act of a local authority or the Commission under the Act of 2000. | 
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(b) This subsection shall cease to have effect upon the coming into operation of Chapter 2.”, | 
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and | 
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(b) the substitution of the following subsection for subsection (4): | 
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“(4) This section (other than subsection (3)) shall cease to have effect upon the coming into operation of Chapter 1.”. |