9. After regulation 76(1A) insert—
“(1AA) On 6 April 2019, and on 6 April of each subsequent year, each amount in the column entitled “Applicable threshold for post-2012 student loans” in the table in paragraph (1), shall vary to an amount equal to X + (X x Y%) and rounded up to the nearest £5 where—
X is the amount in the column entitled “Applicable threshold for post-2012 student loans” immediately before 6 April, and
Y is the relevant percentage difference in average earnings.”