[traceroute66]

> UK?

Nope. Just a US thing.

As you can see on the NHS (UK National Health Service) website[1]:

    The usual dose to prevent a heart attack or stroke is 75mg once a day (a regular strength tablet for pain relief is 300mg).
    The usual dose for pregnant women is either 75mg or 150mg, taken once a day.
    The daily dose may be higher, up to 300mg once a day, especially if you have just had a stroke, heart attack or heart bypass surgery.

Also says similar in the BNF (British National Formulary)[2]

[1]https://www.nhs.uk/medicines/low-dose-aspirin/how-and-when-t... [2]https://bnf.nice.org.uk/drugs/aspirin/