(1) The indexation factor for the relevant year is:
where:
"December base quarter" means the * quarter ending on the 31 December that is 2 years and a day before the relevant 1 January.
"December reference quarter" means the * quarter ending on the 31 December that is a year and a day before the relevant 1 January.
(2) Work out the * indexation factor to 3 decimal places (rounding up if the fourth decimal place is 5 or more).
Example: If the factor is 1.102795, it is rounded up to 1.103.