Entry 015 · Legal
Cookie notice
Which cookies this site sets, what each is for, and how to refuse them. Last revised 6 October 2026.
Cookies set by this site
Three kinds
| Kind | Purpose | Lifetime | Refusable |
|---|---|---|---|
| Essential | Remembers your cookie choice and keeps the site working | 12 months | No — without it we cannot remember that you declined |
| Analytics | Counts page views and measures which entries are read | Up to 24 months | Yes |
| Referral | Records that a visit to an operator came from this site, for commission | Up to 90 days | Yes |
Choosing
And changing your mind
The notice at the foot of the screen on your first visit sets your choice. Declining non-essential cookies costs you nothing here: every entry, figure and table works identically either way.
To change your choice later, clear this site’s cookies in your browser and reload; the notice will appear again. Browser settings can also block cookies site by site or entirely, and most browsers offer a do-not-track signal which we honour where it reaches us.
Operators you visit from here set their own cookies under their own notices. Refusing ours does not refuse theirs.