Sch 28 para 16AE
(1) In paragraphs 16AC(3) and 16AD(3), U% means the highest of— (a) 5%, (b) CPI% (see sub-paragraph (2)), and (c) RPI % (see sub-paragraph (3)). (2) If the consumer prices index for September in year P is higher than the consumer prices index for September in the tax year preceding year P, CPI% is the percentage increase in the index (but is otherwise 0%). (3) If the retail prices index for September in year P is higher than the retail prices index for September in the tax year preceding year P, RPI % is the percentage increase in the index (but is otherwise 0%). (4) In this paragraph “ year P ” has the same meaning as in paragraph 16AC or (as the case may be) paragraph 16AD.