6 Recalculation factor
The recalculation factor in relation to English gas hereditaments and Welsh gas hereditaments respectively in respect of any relevant year is the amount produced by calculating in accordance with the formula—
T(y-YY)
where—
T has the value attributed by article 2;
Y is the estimated length of relevant pipe-line in the country in question on 31st March 1995; and
y is the estimated length of relevant pipe-line in the country in question on 31st March in the relevant preceding year.