They acts as a singular in instances of indeterminate gender or number ;)
:lol: yeah, I'm with you... but it's quite hard to argue that "one" is an indeterminate number, even in this example... I see exactly what you mean, though.
But don't worry too much about what I say - it's just the part that made me go "oooh" and reread the sentence.
And that's only really because I write instructions and help files for a living, and it's one of the (many) things to watch out for in that kind of material: you must match these things across clauses or sentences where clarity and meaning is paramount. If the initial word used for the subject determines gender or number, the next one must agree if it's referring to the same subject, otherwise you'll trip up some readers, especially those for whom English is not a native language. In this case, because "one" is singular, some readers will instinctively regard "they" as a new subject until they reread the sentence several times.
It don't matter a bugger in this case, though - we all knew what you meant (even with the full-stop there!) :lol: