(1) Chapter 1 of Part 2 of the Finance Act 1999 is amended -

(a) in section 94(1) -

(i) by substituting the following for the definition of "additive":

"'additive' means any product (other than hydrocarbon oil, liquefied petroleum gas, substitute fuel or vehicle gas) which may be added to -

(a) hydrocarbon oil,

(b) liquefied petroleum gas,

(c) substitute fuel, or

(d) vehicle gas,

as an extender or for the purpose of improving performance or for any other purpose, and cognate words shall be construed accordingly;",

(ii) by substituting the following for the definition of "liquefied petroleum gas":

"'liquefied petroleum gas' means petroleum gases and other gaseous hydrocarbons falling within CN codes 2711 12 11 to 2711 19 00;",

(iii) by substituting the following for the definition of "mineral oil":

"'mineral oil' means hydrocarbon oil, liquefied petroleum gas, vehicle gas, substitute fuel and additives;",

(iv) in the definition of "hydrocarbon oil" by substituting "include vehicle gas or any oil" for "include any oil",

(v) by inserting the following definitions: