In US and in UK respectively, which is more popular as the past participle of forget: forgotten or forgot? Which is more formal/informal?
I haven't forgot(ten) you.
You will not be forgot(ten).
The OED describes the use of the past participle forgot as 'archaic' and 'poetical'.
Grammatically speaking I don't really think haven't forgot is a cardinal sin compared to some usages that make it into popular parlance, but it does seem that people mostly get this one right.