[Rosie] Re: "u" - I quite agree. Re: "Darrenned" - On this occasion I prefer "Darrened" as the double "n" tends to shift stress towards the second syllable. I think Gyles Brandreth should be informed.
Hang on, on re-reading that my logic would make "traveled" more correct than "travelled", which, as every cricket-playing gentleman of Blighty knows, is simply wrong. Therefore I retract my double "n".
(Phil) The single consonant is the American way but to my eyes it looks wrong, because it makes the previous vowel long, eg tra-veald, la-beald, unra-vealed, spaymd?, Dar-reaned etc.. How many customers have you bar(r)ed? Don't answer that. :-)