I know that if I were to reject a takeoff, having informed ATC I was stopping I would be very grateful for any immediate feedback from ATC as to whether they could see any smoke, flames, inferno etc. Fortunately in the absence of any ATC info there was an extra flight crew member on hand to go back and see what the passengers and cabin crew could see.
https://clyp.it/jrvdzhrw
At 00:54 - Stopping message from BA2276 which crosses with ATC who have obviously seen what is going on and are already telling a Delta to go around. The DAL requires confirmation of go round instructions as the transmission is garbled by the cross with the stop message
At 01:09 - ATC transmission saying fire services on the way stepped on by BA 2276 reporting a fire and requesting fire services
01:17 - ATC confirm RFFS on the way
01:53 - aircraft reports evacuation.
02:01 - someone (RFFS?) cleared all the way down 7 Left