[scaphandre]

Billion has meant 10^9 in both the US and the UK in most common usage since the 1970s. https://en.wikipedia.org/wiki/Long_and_short_scales#cite_not...

There is no modern British definition that is different from the US definition.

[tomatocracy]

One consequence of the historic distinction I quite like is that traders in the UK (and possibly elsewhere, I don't know) still call 10^9 a "yard" (short for "milliards").