Thanks for the comments folks, much appreciated.
Channelling Mr H0ughy with his famous, complex, multi-instrument set ups, here is a wide field result with a 5D Mk III and 400mm F5.6L mounted on a tripod with shots taken every 1 second.
My biggest fear was bumping the array of instruments as I moved between them to start the 3 sets of captures at T-10sec, T-5sec and T-0.5 sec.
Cheers
Dennis