The exact wording does sometimes make a difference, and that's not just a Brit being anal. Had the F/O of the KLM 747 which crashed in Tenerife transmitted "cleared for take off" rather than "we are at take off" it might just have broken the fatal error chain and hundreds wouldn't have died a fiery death.
Full credit to Michael for working on it. If you aspire to an airline career it will help; most insist SOP calls are delivered as written, i.e. If the call is "flaps in" don't call "flaps UP"