DozyWannabe, do you actually understand the mandatory requirements of aircraft scheduled performance?
Do you understand the effect of OAT and W/V on RTOW?
A commercial air transport aircraft such as Concorde may not commence the take-off run if ATOW > MTOW or RTOW, whichever is the lesser.
However, at no point in the 14 seconds between receiving take-off clearance and commencing the take-off roll did any of the crew comment on the need to review their take-off performance figures.