Section 3 of the Principal Act is amended

(a) by substituting for the definition of "charitable organisation" the following:

"‘charitable organisation’ means a charitable organisation within the meaning of section 2 of the Charities Act 2009 that is entered in the register of charitable organisations pursuant to Part 3 of that Act;",

(b) by inserting, after the definition of "domestic premises" the following:

"‘effective date’ has the meaning assigned to it by section 21;",

(c) by inserting, after the definition of "global valuation certificate", the following:

"‘initial valuation’ means the valuation submitted by the occupier in relation to a property pursuant to regulations made under section 26B;",

(d) by substituting for the definition of "material change of circumstances" the following:

"‘material change of circumstances’ means a change of circumstances that consists of -

(a) the coming into being of a newly erected or newly constructed relevant property or of a relevant property, or

(b) a change in the value of a relevant property caused by

(i) the making of structural alterations to that relevant property, or

(ii) the total or partial destruction of any building or other erection which forms part of that relevant property, by fire or any other physical cause,

or