[alexbilbie]

Its an ancient practise, codified into law in 2012 when the regulatory framework was re-codified from multiple laws like Port of London Act 1908 as well as time immemorial acts like this.

[danans]

According to the article the original practice is medieval, not ancient. It's colloquial usage of "ancient" as in "my car is ancient" is a bit odd.

[gjm11]

Fun fact: in English law "time immemorial" has a very specific meaning: it means "any time before 1189". See https://en.wikipedia.org/wiki/Time_immemorial for more.